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 0x0bb20fd1af0ead53100a283c0aaaff694bf2347fc9f27be8f36d05b191b73478. 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/6b57c447-c546-44cf-a70c-71dbb5cdc988.json and https://artists.proofprofile.net/proofs/artist/6b57c447-c546-44cf-a70c-71dbb5cdc988.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 0x9d181b8a08e5f022e507a3b7dee4cf960654d1daa635e0b51d71470e5138bb53. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2030717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a25516bf3622f786c8a34d4a38c29c8cbe37c8d36a25a4fc619979d642002a3. 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/ES71G2030718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603a6744c2d9b5b4b8f1fcad4ca0c174eba0bae80e09c5e4efa9b0290c9655d5. 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/ES71G1841578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659a1531a3df28f6b776fa0de73488c3a322fbb552b7acee5244d18e4453755f. 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/ES71G1937606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f9ae7cbcdd96a6e8214ae9e74dedb6a2bb4f41b247d968a83d2a9e22998825. 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/ES71G1865178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc207acbd8bddaae02b37b27ecfba8ff2047fe8b1070f0b5dd7064047c480aa94. 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/QZNWZ2150357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a18c4d8a6e66598f17dcbb35395f6b31d0bc3374c16a5535a16f39b8c1f0994. 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/QZNWZ2150359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b655b61ce71f8058e38f2cdbeb24f6fc30b8af222c4007f54c1e7156577bc7f. 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/QZNWZ2150362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04e1b405b6717e5226e54d5a0dcbb12b26e0e8d2d1069be8c450d950cf82a2c. 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/QZNWZ2150368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60e59740f4292caa3b274c17d31f2249957b601c452eef7a3b24fd2241d67d3. 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/ES18B1901110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c4711759bd4422370415097c471227b31e36fe2703c8c1f919e4293008beb8. 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/ES18B1901111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42d191374d202a3ef47148f99b7c9d68a6233c8fde29478b08f579a539afaa3. 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/ES18B1901112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1965c492ed92bb0d205cb21481dcbc5c4473aed91788d0ca45fa987ed2488c02. 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/ES18B1901113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d60e97f92e8ad46d672d08f84cf1ec0e2dbd718341a6264b0f0fd791fcac073. 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/ES18B1901114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957fc24853b7fd6b56b42a91e08aae35d32824cab76a1c1ff3c39eb9550817f6. 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/ES18B1901115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9815c09a0260769fc5ba517fd71be8621ae978022730bf12393b165f002da147. 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/ES18B1901116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa5a93df1bee362c3883417503768e7d63a1e939d3685513480ce2a86878568. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES18B1901117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4030221833385d3c2bbc0981d75000ce5aa86f7bc371664f5dc9c5d0c4be346. 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/ES18B1901118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccb17f8a3dba582165af654c27c3f68aca1f93be01f0a8dc63838a75e5ea68c. 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/ES18B1901119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ccf49f1e017ca4fa499904692d74e1892845e0506bf5919c2b8e5e5a4e912d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ES18B1901120.