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 0xfacfdde0343b2bfbd454fac01c091debe52b7c4866f728613d34176be4e24c9e. 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/2d4be3c4-963f-4580-b9d7-4bbd80591863.json and https://artists.proofprofile.net/proofs/artist/2d4be3c4-963f-4580-b9d7-4bbd80591863.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 0x4325288bff60b5aeb7204248f33c5b6dbbf9f572b260e57deae755648c610064. 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/QZNJW2404148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14256047362af670c578493e082a2d41bc56495b278fff798ddcc2e8cc321f7. 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/QM4TX2480682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1dfbd08d089ef1cd60afbc5fd4c2ac0c64aeb570f8cc2f3178832e744a96b8. 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/QM4TX2432836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708fc6a64f215bc4aa6fbce74d17c48973e04af86a5d2f92ec277bd8607baee4. 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/QMFMF2359508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb7615675aaf8fc60004cb0a0d6e9ad4ce9ccab421f0e69ee5a992e3d6ad916. 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/QMDA72360750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7187d3d8a76efc59ee2b689faab80f0829bd0834cc5f19e34c8428683574ff70. 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/ES64E2303595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ffc1cea636f4e2a996a0dc49f026d813c093a0d096b75467bb7367e68a0e23. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ES64E2300246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ea26a63fb407499bc84bbfeaee18b225a477893239a168b2c42161f3ae5644. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/ES64E2302468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4c7d28352504d226588ac171ddef61640c996629fbb7d493b685437e64ae08. 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/ES64E2303598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2e08ec1e68bbaf906d340eed2352dcee0674fe06c083e96241a20d00e7eb7f. 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/ES64E2300769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70d19481e680a473448fabbcbae8f09d9e5f0a0bfdbd0cc28e9f2cc75f1dc53. 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/ES64E2303601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ea26a63fb407499bc84bbfeaee18b225a477893239a168b2c42161f3ae5644. 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/ES64E2302468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2e08ec1e68bbaf906d340eed2352dcee0674fe06c083e96241a20d00e7eb7f. 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/ES64E2300769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ffc1cea636f4e2a996a0dc49f026d813c093a0d096b75467bb7367e68a0e23. 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/ES64E2300246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98439c9dc4b7ab1a61e207ec885e1cd56e39986a2a51aaff03332afbf16288cd. 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/ES64E2204318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee5eca76a4d03c94728c2ac8ba7c0e11d31513fb5f59b1b37ab4c5db951102c. 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/ES64E2200279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e4945652ef753e49111fe5e0754b7097058e54ebba84d2eb9d7a8abe496bd0. 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/QMDA62440147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735be51a75665f55591739bb093d4dcb2e9d6e502284936038ccb3561beb2469. 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/QMBZ92471960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cabecbd2d4ebb001d69e6beb6aff66e70a932997b4321a762f293150c19c62. 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/QMBZ92427268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94fe87fc59585334f3802b3c4c05c99bb85c6c41a4e5b6d29e01898262b299e. 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/QZDA52428907.