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 0x05da58cae89418129a319f3ab24e161d3bc48c7e40064dd58ed2ce54a4f86cef. 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/003e4fe4-db61-4fe9-9174-91d882e8b8c2.json and https://artists.proofprofile.net/proofs/artist/003e4fe4-db61-4fe9-9174-91d882e8b8c2.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 0x289baf15011b07d183d3ab023036c12f070dbdfe4a6aed91f27c4c3d7491c2f3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BKD9Y2453243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702ea1fb76049afcf1f71959c57be78ef2209bfb877266fc70b59244dfc54ca8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BCA2A2401110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc166d99fe3be89ba582698bc483c75f51bcaa2b1068a0b74ed970d88df5bd54a. 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/BXTRN2500598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f6359484befc63c3ccf2695193f9843560ab93a022d48ca8c7bfae95bbbeec. 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/US7VG2582381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f9b76f2a8b3054dacced9fd5785fa679c5edd56220807a6273a7c460f0ec62. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BKD9Y2453235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81acb2dcf1577b0624cd7a77edcea41f11012aed7b7e5f355d11dcbebb897ec9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCA2A2400996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82239277b84e1b221ccd4c3ba51a5cf4a16a178bd653bef11553ae258e3cd3e0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BX4IU2418023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6591a7c3d8796dfb778d150b979bd0bb09c1bc90e5d05fdb245ef0bc1c0c5ae9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCA2A2400818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e0324ac7a5e66eca340ea0487e07872efc155305a06f133ea69a2c49af01d9. 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/BX4IU2358788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc450e6e8b5a7bc4e4ea32ffd8f05d3725f94586ef89e514854bd8e7a30794c77. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BKOMB2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97274b1325cb0ad49db586bec0722f78a19a1a2856a86d7e3a86f1b07f766124. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BCA2A2500171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2093d30149237d04b6543f28535d4765df6334bd16faddb552fa936c7d1297ce. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BCA2A2500148.