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 0xa783333dcd3234997861e80ceae87b979668f9b04d58916517c42dd072f38969. 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/f373fc46-0186-4ed8-8b67-026f6a14d3d8.json and https://artists.proofprofile.net/proofs/artist/f373fc46-0186-4ed8-8b67-026f6a14d3d8.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 0xd06d5af464fa568857abf94851e65a17a524d9a60ec17fe0c859541a43fbf85f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DKGT31700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8652b43bd22074781592e449532a5f4f69602c8a2becf151f43630506fa8b4c9. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DKNT21600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e4e9152ecdb70a37e1b8c2a7cd428736d4cf544be947582322d23eecdda17b. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/DKNT21600107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd19f60a6b4eca0327dc2337c90a13ac1bfefb92221fbd2d353fc9d74372eba. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/DKNT21600108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0731aa1da665b415780ee45b66c4e38e12474b751134634b6e85bd95fb50fc36. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DKNT22200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f7fd2836fcad3beaa3da71a5d618409b45d4ebf5e30e3e24cd2e6376389d66. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DKNT22200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb428b8a8076de21685ff423cca6eafe75c7e56073c30b0414ec41b5b33eec84. 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/DKNT22200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f0c8c7011dc04296f79e2db781016b7fd714c314fe50954f129e61f6f62a6b. 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/DKNT22200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1af42dcb18c80ead597ca7bd5b33d094f4c5391c27137e9d2f150b19362d8e8. 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/DKNT22300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18d31864cc8ccf113a55cccaa332b01d79772806cc69d87431f7663fdb4aa97. 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/DKAB92300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246afb43e8ce3f406cdbaa801a050fbc001ac3304bd3e8a3f14203a610e519d8. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DKNT22400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d26c908c556a3bf75d25e97b6ff00837d75609bc69b3cd5a3faed3e4a6ef980. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKUM72300209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3448851f968a9da40abf151a3035734cdcb72003e293299e8cf1e6945212f18f. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DKUM71000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f3de6179bdaa52d7a34da2ca120a3a3bfad351f32f9bebf65b6396de49e2e4. 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/DKUM71000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd3e6796a551ca5e48df1be1a5b37a4633ba9febb4c8fd2232ecdb90e5b3096. 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/GBLPF6768842.