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 0x25946c13f5dcef5072967659c731bbb74d2ac636149744b11054b5514665ffa3. 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/8735ebda-cf16-472e-a5b7-8fc183aaad04.json and https://artists.proofprofile.net/proofs/artist/8735ebda-cf16-472e-a5b7-8fc183aaad04.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 0x37bab3eff861a1a3ebb5945afa295094c49c1e743c385be8b248ec3d30718a1e. 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/TCABQ1322549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1ad41b790ae97fed6603681656dd9715495c4de2d7f823913340b91afc57d1. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:26:17Z), 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/TCABQ1322550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd027231f1b9f645ba653836f6389991e85549d75168c5040fd711a33ec60ab6f. 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/TCABQ1322554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c6eb4690b07f75ae6d42876219b0180228db6a82de71d787da467ebcb4fbfc. Chain 2 (Bitcoin): anchored in block 957665 (2026-07-12T06:13:49Z), 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/TCABQ1322556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899f97d676d07bdaf61431841c529d0c4c6b873af38cc2a1f5706a8f7add3ce3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:16:14Z), 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/TCABQ1322557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba089a95ade5f3d3d23e8831f5c92492fef5c80c2f8417e6ded0f131a8db3e0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCABQ1322560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89568a8d5f80de1910dda83a0c132fb9e0791c17b7b5c754bbcbbcc90c2081a0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCABQ1322562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48ac17318bacbe406bf1b6da2f9acb5d33e083c612939323e30f7fbd40588d6. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/TCABQ1322563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7eabe998d5361ca0a6a3aa0fc69d1412ac1bf03e639998a5cc3cbc52edcc12. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCACN1650985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144a0f479df72b7a71e9289a65f6eee2c170104bdf2a88ba7d5ecf82e79c91f1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US7VG1648123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e784546fe565eb79fd05e7c65e46e040d4978210305749a2574feb86f698aed. Chain 2 (Bitcoin): anchored in block 957655 (2026-07-12T04:42:44Z), 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/US7VG1648126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f6762cfe426d4ef60bcbd61507f8a182310213aeed11afa8fa9f2ef622d45. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/US7VG1648127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69745d8a286e22803e7d155eea322d19ba4bfde323f74da7eaaf4af725d5f193. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/US7VG1648129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc559dfe002937715fdabbf49b163433ebf909ba3a00cf2947988920b224bea. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/US7VG1648130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf3b676356f970f3f624d7156a50eff5fea1bbdbe5d74a10ef6243985bf4de2. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:12:56Z), 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/US7VG1648131.