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 0xdd686c11f2da58be3c7f45e9dbdd013c1a716d74ae77359e7436a114d002b64e. 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/09c95530-8a0e-4a28-a74e-31cafdece89d.json and https://artists.proofprofile.net/proofs/artist/09c95530-8a0e-4a28-a74e-31cafdece89d.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 0x06da8b586d65c8e728ec1d2a1a90cb979ff769b55707a34be379f748fb29c45b. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/DEBW20600043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b578c5bc7281b4bcc89aadf6b69a8b34e02f6ebd727a761082f71b89986106. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEBW20500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48181508fe07a4ba4f2584b2c5a3fbb3b86d213781c24decbd63e35a5fff556a. 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/US2J70714703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40acc5e6b710267321b965f7b56014c214a7b89ff1eb136ab5be62f6640ab15c. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/IT00G1100431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf52c7b58ac8ba1efca9ae02031e345064d793be61c4f508e4f8902cd7df6178. 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/DECY51311061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40b346364687a0ada532848bb1557a96a1b7d4fdc8068427299cc0f4401e7bb. 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/DECY51311062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92816fff24be1a23e0afa28e792ab4cd352362968d08a011c072b0fccfd0352d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ATMJ91101506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c03ac6cb5e3112ddadc71dc0f3279a378a94627bb27683201276cca1c84022. 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/GBEPM1401086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fbeb653d4a315d62301549f9d931d567323b149a2ac574176fe9357bc1e2d2. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DEY471980247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30562db3833b88fdc26ab8cc2c61fad3bc7a131376b06c4c1367db0fd607253. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/DEY471980248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fee4ac94a1539dd1af1c415e95d671d033a1db7c3a3875ac4cd81c8ff52936. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEY471980249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275768c934eb9e372cc666ab665c7012365c54349faff5eac31a063abe1bf2cc. 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/DEY471980250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e92a08917635207838da12d8e5f285fd522c51a9b2bb60faf5c293011a33659. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEH741310420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851e63e9a69a287d053049f41bd37a40f6043ff0eb5393d0063aa5e97bb8dd39. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/DEL020820067.