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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ef6d9b5c1473dc84f8b81334262d765ff0e8922866207e80edc7a9a8cf62aa. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cbeb6542-73ca-420e-af62-3e44bccdfe00.json and https://artists.proofprofile.net/proofs/artist/cbeb6542-73ca-420e-af62-3e44bccdfe00.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08be5c2b8fd59e67e3825ece85f37353dba9dbd03e020b86d2a2fd076665f88. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZMHK2235310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8ff6deac9f60505f65562306f0bb6101a3d8a68c3603d3dbbf0049d51d60c4. 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/QZS632232546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8541e83be0be70f91a3ae1b691843fe4184b9cd14da2eec03a94023809507513. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZS642274893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8c5756a7d0798b7a8d75650d0c511da1ecfbc92ac7e676d872927ff02cafb3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMHK2243293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c3a309614eb2b8d21585362c69279fee9f17b46a9e27a726d369c1890ed1ef. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:42:35Z), 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/NLCK42237023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60171c6b74ef4d7098b632b52b2e0ef09ff486612c8fc161a5931f7516c28622. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/NLCK42237024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f15fa21031abdc9371b270058d3edba51bc92ad9fdab3a5e3d30f67cb71d3b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:23:44Z), 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/NLCK42237026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a582cca073361ec8230f5f5b24af388cad870bcddb6c96f36be475a2f8c744d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:52:10Z), 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/NLCK42237028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bdd73ff450698fc837020f745613ca7bf33e183fb63cc706686cd053bf980e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMHL2476558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc2ae757beb2a36a8f36fe3a87b7d62ba8fbb0b4af70c185abb748481ce9607. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMHM2452136.
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 0x091e9fdbd7ab0d001e03d69971c974d06b969327fe4b547496d0c169899c4290. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZMHM2460693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673bd348d7405918dab4e4d1df54e51da420484801ef8665b061f0a45f3249d6. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLCK42238425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcb739e392880baf49226227981af9535444f77a317aaa6bbaefb59fbce21c4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN82447313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15291bf573fc0e52554500f73f0712e3b5d2a86c87d1af42847a8cf3c8b16bf8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CA5KR2475967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0bbff8819f0b5a4e49a6f55f5f7f99f65e4abc263c7e1af6cf8161d8f6b40a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/UKXN22341440.