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 0x443ea47dfb548d154dfd59c257b9b09b519f9f855ad60bf3b0cfb024140baaa0. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7be22b13-39f0-4b8d-99a4-3b90774db41f.json and https://artists.proofprofile.net/proofs/artist/7be22b13-39f0-4b8d-99a4-3b90774db41f.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 0xe220440e898bb5ee273ebd942b52875ca232d558ba714c6a272198bdc4b2a14d. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USHM82379252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973f0bd8aa61081f3faf36a88a31180575284d3fb8fc1ee9e40233421ad84737. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USHM82379262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b3181ac9a7ee4a8d2552a8acbf1658d7fc40dda4ddbc2fe45e9933055ad87c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USHM92435675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5078a30e839c40fa92fade87d43993ad76ba21366ed34c398feb14ae560642. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USHM92435678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38f9ab542be55bde6ce445b617ceaff2ff22ce73c823b7cf5d73761b0021900. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USHM92435683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612573fd04fc6d73a6bbfa3fb8c45469e8f40f56ef0db6bee05bd40207628c49. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USHM92435763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee2816249a2d2cb96c40f1149d6f7a74395f9ec129109969477b562d61adf43. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/USHM92435766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db2aee37ab644a8740b6d587b521b93fb01d72bdcf678fd210eacf5d0856d92. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USHM92435767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ed124432808eec2282c54f0f4f67f17bf8b497c4e9b2a6163331cdc5ac4cd6. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/USHM92435770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dce6355bb3df006306345c2ec0cecb5d947909afc7bdd65519184d746dbdc10. 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/USHM92435772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c0f02a94662482244b57a19b84e64e9d73426c0932ffb65dc871b05e47c897. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM22543061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17879b019445a4a4e7f9500f7a96c2d0a885b387902cc0e70ae98ed9ab3a164. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USHM22543073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcabbc9ed02191d673b3754ccfa095feae1b110a2fe1f79031ca4af04bc0a33f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/USHM22543120.