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 0x277edf23814066eefd508e77ae782958c152d322de2b39cb584f4cdb6a3b7a74. 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/ea1166a8-0ec3-4c81-9a3f-5d5aed2b3f73.json and https://artists.proofprofile.net/proofs/artist/ea1166a8-0ec3-4c81-9a3f-5d5aed2b3f73.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 0x354089500cd823b19078f139dc61b301e74239555f7523afc296a49605bec53e. Chain 2 (Bitcoin): anchored in block 957705 (2026-07-12T12:50:42Z), 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/IDA141503213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee5ddeded8645ceebfec4add5a28f70649a6dcb0dc74811a6bd0b1dd6ba9aeb. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/IDA141503215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c75015bbf2d4625fd05db5a60b63c8d015f7ac60ff6305376e3435b72888da7. 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/IDA141703764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e55b05d9de46376d2aa74ae58b9201605ad26f0fe76a662c34f11c07bb93436. 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/IDA142102942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3425c61c470f8278a5cc753eae90328e23015af6da857e700e4d352dd5c1ba02. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/IDA142102943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07e2a0583b7cccbd52319a9387157571ab7ad3ac163c39eb3a31d450e98a703. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA142102944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8b148ae2e4122101a4e29b7976023d9c0163a21c962834e1ffc18ee2fb41c3. 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/IDA142102946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327839a973a6eb2ab7c48c6de70bd9c83160c4d5cd1aafe3c74e77da14881002. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/IDA142102947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74ce243094c61ef62a8bd7537cf93973c0a5ad0b5abe21b4aee1fda8d719a6b. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/IDA142102948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e7fdd78bff8d396e269b4d70c402bcf4ad65bc53d912272bb555d01b769dbd. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/IDA142102949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae3dd7444a8e689be0734682aebed3ed358297e0cc44d0757feb870624b33a4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/IDA142102950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb36e5c582373164754a67658473549b4c65b5ed53f153cecd64dab484b9ee7d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/IDA172330021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21c29b6da28a61d1826a07fec8c383b90a1d78b3849e742373f5c6067cc5a3a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/IDA172330022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8c674ad631b3aa2dde110a9975c0bc213ebfbff7f1ddce78d4ec7689bb980b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA172330023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5c732d2c4150ddeb7c5070058bbd14b18ab4d4268b5d5402879a02174c13f1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/IDA172330024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd936a64ba3cea01d7acb38126bb9979f8e3ca96f817755800a9f845a4a8b54cc. 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/IDA172330281.