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 0xfd7475586c04e944b3dc1a46176538417b9a5622c668f1289f5defb74394f046. 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/1b4a373c-3082-451e-ad2a-1a73b4c22c17.json and https://artists.proofprofile.net/proofs/artist/1b4a373c-3082-451e-ad2a-1a73b4c22c17.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 0xd5c35529444266cfd3fbf3c4d7a7a938fb4c74c74352155f2bb6167428059d12. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBJAJ1902566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaac3b9bf6df17c1aa3143194b37bd8e4db62e72c6ce88284285f5495051f80b. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBJAJ2000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab7ab4291a96b1d28f1c6d20a7045f3b91289b2b0d805a7bf6c90962a0672b6. 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/ITSV22200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712fb4163de8b93af5cbf46840bc4974ccccc7af46c8b87a79773b6063d1d634. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBJAJ2200448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa2f6d65cae5da66ba3fb034e961bcc232cc95c392f05939b4d9ffae68acb9a. 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/USA2P2310527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d4a575842a405e53bc80aa7cbfad37c2ee75ec5bbe15036a653f2ed96572d4. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:40:43Z), 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/ITSV22300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562fc224da90777b7e6974622d70b280ac0295cab58cefb89204c0f64ed56c72. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QMPLY2300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24033700e996724845a17d43fa6ea5c15d0725343627d091ab5e9c4cfffa1bc3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ITSV22400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4af21ba6994a8209eecdef82ac5dee644039fd051aaea942315be6b57a8f78. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ITSV22400166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6240028afc29ea4df8a21d5c5d1ad477bb8ec25e0e431699347e96714d85766c. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ITSV22500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304997dfbc19e1f45003a1e6842e3eaf96b6af9b7e5506f4c7b32e14b27f797b. 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/ITSV22500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe956de4bd975d9b4a2057e238c63d80240659af1a6ec49975010c61e071c3ad6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ITSV22500070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b663ff2aa19797044d7351b71af9a8b26ed887359c5b24293b7eff1a52a550. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/ITSV22500097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c02b054e9a55b05925fcdcf9eeaaa6f679e69fab40d31385d4b34d3204b3442. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/ITSV22500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2c86031d88cafe09ace3dcf2195b3f7fdcc626b7cfd2a62d7c212e428400f9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:28:02Z), 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/ITSV22500155.