Lou Doillon (born 4 September 1982) is a French-British singer and actress. She is the daughter of French director Jacques Doillon and English actress and singer Jane Birkin. Doillon started her care
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2041cccaad84404b0a03ad5ba84d84f93e46f1e425846bde176edf59ec419a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58121c66-2066-4700-a615-ae81b1d79b19.json and https://artists.proofprofile.net/proofs/artist/58121c66-2066-4700-a615-ae81b1d79b19.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e97bf6a2bc64ca4eb8f4da1949cab55a5b78e256a2b1d34f7f5b3608390fce. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71200490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda86b496811412cdc8f088e089aae0b2d1ec4f7e144d55e4a87be70be7cac4c. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6eefddd01a6a84a1e4a27c991bb273769a67e4288d6688e1799207fec8afc34. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0a12fb60843a2c10f8cfa7962fab24eb81e9558ae1fdd5f0c531c0377938b8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5db222f67ea5bcc3fe97784e5198ac64b6d269cb4a254adabbdea9ad9a711e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa9743ea383ca9070403b7b6d097c7ca392f63518f2526d062fe17d721061e0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e97bf6a2bc64ca4eb8f4da1949cab55a5b78e256a2b1d34f7f5b3608390fce. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71200490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda86b496811412cdc8f088e089aae0b2d1ec4f7e144d55e4a87be70be7cac4c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e97bf6a2bc64ca4eb8f4da1949cab55a5b78e256a2b1d34f7f5b3608390fce. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-19T22:49:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71200490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda86b496811412cdc8f088e089aae0b2d1ec4f7e144d55e4a87be70be7cac4c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed7eff71ab4bfc10b0c0661ce39397e29573a4fa25cc2ef745106a161886a8f. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0989b1770325cc9d95f31dc61da7fe5e629ab617c142ba83760887f17f3cbf9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0256351861facbc29a12397d77ac6e3ff4f585514c67c5c660e080c996174e. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6eefddd01a6a84a1e4a27c991bb273769a67e4288d6688e1799207fec8afc34. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71201523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb481194b4e89358be42b300c5dccec29dce89fbdf1ed04a299451af0f73ec7ff. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71202860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e91898568abd9e451f91fa33c16d9eca68e92e7d345c03ab23e6b6d729521d. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUV71500363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ab2822b30d9a7bb1c23096e890a64da55e094515759cc4fa77a7c7c2a02834. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed3f0afe655137f17fd36ab72f746fc5523c02288885e082ecb8eb9db96d01a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8343c8da8db621b15f6970ca97a65c08fda146cc8f37a45c246c24acb31ed92. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:10:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166fd487ab51ac26af72246538fc5873fb795e9417b060175c3a9cd8623c4f7a. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926304a3605d54cf5bd806f0c0921933e3ee8d88f517d78174df4c8a6f848d94. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ff40c95b096c7b8147efd40ee3e18237b42b3f4af05ea0ec9303edf1bca0d8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd730a956b06e608a14b3fbe2fb24903298567bc77405f09a54021858e5474169. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T04:48:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab7a93866eb4fc218037575eddc299eebf8513657056c9270d79d9aebc78840. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4536fbd8130f655dea6f2ff6435421d1dfb303206529c7ffccda1f65253864a2. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1c034c5bee4434571dd21da4ac2d141a41da1f72d11174a94f250b84d534d6. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71501586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324b12026f3dffca20e9daa389bed3c25c09470ea3ef7bfdf5a91d28b74abeab. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b60a25d80da9e54a5886e59ffa2c375ae3ffcf8b8f9f8f63cc8c0d052054dbe. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed270f3b97669e3d9f321e90cc39840e9a64f11c42141c7d4e68ed38dbac423c. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1152a016d1a138a20b2e69453560c328345088fc974bc2869a4eae8254edd945. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e342a8a5831cac4fa401ea526676815a5dafd72a7a55cd3d30e1c384ffadbe. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e98387e6c1b72d1d11488ddce8838d5be32b8fdcba3ea812b42948ea0a259f7. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aca7f374e1da3eb3f6e549c67cc9d046943e982b585f87b9c11ca2066ad9aaf. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebdde62f7067a47049dc03b30db47b72e172896f04c645b8c65f4d1cab56cde. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71802185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bd6145dc4ef4511c5b9836266f09b7c418cb2f71818accb4ac08f4f4e1b2a6. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:19:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRP3F2002620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9b4dbd01e0ba36a1dbd9510bb40a03e48695ac7a384eaefa14679e3b5ff218. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRP3F2002630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffab2a924989f785907562ca28673a04b941cc10f7793022284491790cbf785. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRP3F2002640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8081eb4e78ea58ddf6270842a3057ad5585dd10e9fb21916891789a5a9385c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR0Y31400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd62fb1fabb6364b06a528a297b3273d08ce1e2a86f50b967c0ef2512526f46. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71801477.
Cœur sacré - un hommage de Frédéric Lo à Daniel Darc
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22913b8af818db8b3be56944e85ad3a3c67a3486a517ffb6e65f272457f7183. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR98Z2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22913b8af818db8b3be56944e85ad3a3c67a3486a517ffb6e65f272457f7183. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR98Z2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a04495efec1c3298c943c35b72a7dd0e53e23f72a38ef55372da787063d73a0. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR0Y31400008.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch