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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41723bfdcb41cdf4fcacdd1003b423aed304306a66f24d38f1332321f1e929b. 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/002d1795-da5c-4c7c-8cd1-8e495ea7a78a.json and https://artists.proofprofile.net/proofs/artist/002d1795-da5c-4c7c-8cd1-8e495ea7a78a.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3d7e5a67c7520df0ab2c8c950870f60a528d56d7b655c6e2b89e14a57f5ecc. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEZC62338283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b77f7ec36e3f24093c9247873341c907e665a25736b8ef9a282e1b2b44eb65e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEZC62341025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f7ca682c2f012d0ebd8728bf4942d733d8e09606299b151c5de15c0d1c7a27. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEZC62341006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e9cbda6dbd917a4591bb2c9ff7043c7f3ee0a35ba7f7c6f7b2a8b4b6d87d63. 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/DEXZ61900416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335a48f65a9fbee175e6880e9db13fbeb98edf274cdcfd42905dc86aca1fc7eb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEXZ61900417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3863a3d0e19e67ff231a9e7764b10e375d45dc586d30a2905d378d5f4c6a64b. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEXZ61900420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89fced94dcf2f35bb5b74e92e9e875af779c51d532d31107d2223750356302d. 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/DEXZ61900408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e8c1a0ee718ba6ccb70194fb06aa8d566732db525c29688f46fb1db2a4d6a1. 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/DEXZ61900404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabffc5f8431adcf3a525fc9d2638baafbe864c27ca036aece3aedac5363d2606. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/DEXZ61900397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a091eba9334b5d3fab44eb9199cbf6b16b44f3cac05942526a2d0174691f7d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEXZ61900399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48ac2fec140b56a8e7a7679d8ea8756da81f1ebb8dcd01e1fe39f06b8ed8edc. 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/DEXZ61900393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248e72c007c70bcf8c06dfc2fdac5f1d1353c084fe3c146100504b3d3a0e14f0. 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/DEQ022391019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aced35425f71dec3033983929ae11fdf1c6166f99925f389570bca445e1c312. 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/DEQ022391020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3d7e5a67c7520df0ab2c8c950870f60a528d56d7b655c6e2b89e14a57f5ecc. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DEZC62338283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04e7f88136af25041533a3e435e31e7d315dc1d54baf39cc1c760077a35940a. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DEXZ61900340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32256bf80bbb0b4ba2de569c6995a1a0170089d47b5590270b4eaed8032b4662. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEXZ61900329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1061089fd4902706ef2d924b2399ed773f8e3f8d38ad6405cb10b9e7a2aa48f5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEXZ61900285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108da69d5163e31dd4f3648f07c83b4ca27b41ccf99d2cbfef8d883d2e7bb878. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEXZ61900286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314184c51a2cbc0b9f17c332c3f012f42b24b87e6dc25fdd96825997fa94b3c0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEVF11900783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721ae75631fab8cfb2e003e50b83034a97e78dbe4d0ff127671d69880f606477. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/DEXZ61900263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72987254bdd2d81e317e795276d88df0d990c1df99bb9440410ca6c25d288dd6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEXZ61900262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cab4802a8d417376b6d259511498084d2296d7cf9bbf46305df802c16a4bb09. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DEXZ61900224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7078d38232e2a517d62b90b0772cb678edded3b80aa837632d82cfe53db03f61. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEQ022151319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe119ff336d00b6369676e984964b7cb0ceae0464c5852905f1d5a558575460ae. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEQ022151320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cffa0f80c679a0a8565a390ef7f9a2419c211cfb755b8b670d42f24856b29c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNMW2199258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f74a3fb1b312b18ed19318f9961176afca45445292c2a83c4c459f7147fabcd. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DEXZ61900118.