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 0xe2d0fad79270a574f2282e8ab035875a6f8c41fc31f5fe54d98ead096d37f627. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06054858-b0e4-49b6-9b2b-37a5290b216a.json and https://artists.proofprofile.net/proofs/artist/06054858-b0e4-49b6-9b2b-37a5290b216a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rules De Las Tatemas (Seguros tumbados) [2022 Remastered Version]
Rules De Las Tatemas (Seguros tumbados) - 2022 Remastered Version
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 0xece272b55d2450d40f187eab0b6df8e332ec5cd28429a7f76e53ad5edc3af10a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/SE6I32209842.
Corridos Con Historia A Dueto Con Amigos (En Vivo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4deab679d354c40c1bd631b508c1eb7c82cbb10809d032889b5892ed9747052a. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/SE5752307676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0ef0857552291c288759cdbb5395a1d5993d2c411918a95726e3a63ba05242. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE5752307680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dcf49f12c489806e327ddd392a256f27b489303407cc502684d26571ae48ee. 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/QZDQH2386979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc593ac9a2ec94dee7088fa387ec566b781095a0319a4cd91c366e7b3d506e577. 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/QZDQH2387470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0615efa514e38113b5d289ecfabea144bff158724086c8c5e599751b501f0d. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZDQH2388573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20419b01a4ef0b7f66c57dbe04c988d70631ab0e0cb47452a5530aae82cfa057. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZDQH2389322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552d9f6e7daad02515ef315cd66cefeab054010c84ca09c084dd1ae107e92a9e. 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/QZDQH2389321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d5c383ae06d62185293a389c6ff58d34a3794e79122bd1715af96c444d0fe4. 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/QZDQH2389335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644a4082743c19901357b65e326a8d614c4f37a7b826c684f73f664b2f2ace1d. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZDQH2389833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577a44fc9847b5e47a203ef50935ad84221b422f024caca86b718247ed171956. 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/QZDQH2391209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e38534010867b58d4e7586e606dafbeaa5a8831fc8e9fccee9dcbf49e430fd3. 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/QZDQH2412388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5049ab43d71f483682a6462e8ed08e3f7bf29c73dcd48538eea788b813ed316. 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/QZDQH2414870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e8a7b0517d391f6f57a6fa8b800ec3b6e420e3d98fba7883c618ff63f5d76d. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:23:27Z), 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/QZDQH2415372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303b180dd431b377714ede833b433397e96886fa7b75d893f7224958fa6c0e80. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:35:10Z), 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/QZDQH2416519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c8fa93ceb5d52f30f871456f5881d4a4860ce86445a173249e369f87404a05. 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/QZDQH2416782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d860984e159486eaa452a7efb3d51d78295a3daa9dadc829eff22d1e3352d21. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZDQH2417044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf35678033715d314ff941f2f35f004d8c150acfe5a1fcb3b1b4fb7a5f2c4ca0. 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/QZDQH2417274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ade962fa910adc6113ab73459f470f935f956bc28c9151d6951a52e9bbf409. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZDQH2417680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b8c1d202db6cb0d28a61290760cb5633ad28a212c5759e619f458de63c3a40. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZDQH2418458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46daffcd3e381dd06ceb79d5414f1d795bf55d3ca36a6cc7c52e43a9532dd549. 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/QZDQH2418317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9f1421cbc0948fbbaf900ff17e30c703c5cddb326088d11f7d1c6e347a8cb9. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZDQH2419106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad85bf63f936659fda4a7dd281253a0e9c818fac6f48a99b87f01f7d5ba778e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZDQH2420481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1526b374be8267524132b117dc45c0056ae6be2a413f6ca4ad22ba5bd5e3395. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDQH2420482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30fc09ffa2295bf48a4e70e5db1734cf74dae22dc05a62801a56cbed7d15089. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T07:54:57Z), 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/QZDQH2421296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2174ac0e841513a4fd25ca705cf022f5e72450c2d69479bcf399626be28ebaa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDQH2421997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6a4bc020c7bb7197b23ecb30d16b59fd5bac0c11f9abcd24328f840f05f398. 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/QZDQH2424520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d3144aca8e89f1e9467cde0c45ba64c3db7ef5feba6b97e203c717c203190d. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZDQH2425370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93059c7f158a6364f19239351b8a9f22c7cc84308164dee61bf0f7895bd6d9de. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZDQH2425371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1157ec9103c338cbae8ad841972e3d450c580c4c5207531822ae3456fe8bf741. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDQH2428205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8b385b15e254122ffe9530ac8bf57b252227677a7cb0ce2be01e38eff95e59. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:01:04Z), 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/QZDQH2432550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ceb9696f694f614a25873b86b012613ef45819c92ea86c31e610626ebb3819. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZDQH2443861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd622d1716afd39065b5730aa0e0fc73ddeebbc2d37983de899f7af281a64f5a7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZDQH2444442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0333ffcd7d01a0c2a3a7eb672cf35af1226ca911bbea30537ff7f6d0c773e064. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZDQH2444443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544110bf3ab3ba50c2e31d5a6c6ea96efd8c8649249d84662b75fa1ba3770cef. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QT5M42593092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e52bced6d8cc595960389ab96ec0b8597672775e126885d557fc7c3d8d9f15. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT5M42516569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc2ffd12a0eced1605abaed529da0917ea76d9a4a54ad144a22c085583b300a. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT5M42574225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8af5f406545171bdcd121a379e2ceda348740990dc07d106db5522e9205995. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT5M42568148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0abc8e200b0ab311108db3d6d36c7258da932062faf677197b0a8be9e58ed563. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZDQH2396122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb696b83611f1790fab6f4532e930fc74bc7c44bb669d5ed049d7c0a3d4e4fb4. 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/USANG2409401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afddcbbff096491cb55f21d827a2476658eaf114843e4eec90d240351f457e8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNW72415048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16fcf3c0af47eafb301e1a18a555fc1ac841f627e36ede9f753733d66bf4f4e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZZ7W2446749.
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