thumb|Felix Martinez of Grupo Compay Segundo with an Armonico. Grupo Compay Segundo is a Cuban musical group created after the death of Compay Segundo by the remaining members of his band and his son,
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 0x6723f2af8c7b2c43cae37ed38c1f8f6e0b8de95e3ad8f2159b93fa61fd2c3e93. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd288435-3e67-4454-9659-77667587f8ba.json and https://artists.proofprofile.net/proofs/artist/bd288435-3e67-4454-9659-77667587f8ba.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 0xc89e28548aad727f4f54cd913a0efbd262982bbc57f000eef78a8862ab148432. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/FRPA41400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1312363eab476dd6094bdcc60c3d3c3605b81da510698e3496d0d58680c5b08b. 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/FR9W12216263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1e718b96aa6954ad490dc3f51c176ffcf4e53686fc6d5c38f2012630ba2971. 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/FR9W12224764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62deda4713205f76754103d0612054a91e98d62a91b0bd7e59b3bb38882b432. 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/FR9W12151020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcace7a68d65141c56d75559d7c97d59ac502bea9095b833c171124c6f3736d42. 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/FR9W12151021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeee2c8364cb6ad36efd57493352f1d3a7e02a4d5d8555c2178e54ebfed14d6b. 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/FR9W12151023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb29c47bd4dde20aa3d5efad572fe1e43420f5f70ae7d6dca14d1ba73ae07d4. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FR9W12151024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27211fda69ac26882121dd2f462e97f3aea8075a50598c08861c852c22e3c6a. 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/FR9W12151025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d02e3437316c88e015b502333c78abd18b78ec4fbcd8f40b5e9a58e311ffa32. 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/FR9W12151026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb385c27c8617e889744c27a7c95b497a8fe5512dad79ce489979dbcf1a6c8108. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR9W12151027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568e8f12c2c6be0df840866ad49be279cdbe2b1e24bfc4122028167609db85dd. 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/ES5300510004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568e8f12c2c6be0df840866ad49be279cdbe2b1e24bfc4122028167609db85dd. 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/ES5300510004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae157664153575294a5cd726f8bc1d6ca982f29e55ee1c76190ace685c713684. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CUA021309974.