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 0x52b3b64230e1fedd8c15cde7d6a1444e6f4e0a2e4a411314eca021a6f300c249. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35b737bf-4921-41ea-955c-ef59c243e13f.json and https://artists.proofprofile.net/proofs/artist/35b737bf-4921-41ea-955c-ef59c243e13f.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 0x40794e5d78e95ee40d6eb2cd17b0374c203fec5e1c5a468585a92f98e2cdc247. 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/NO0T12029010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca609f0f4cf77cc302ae7680ff7c6ac5dc6a15504b29ed907d21d91b09b7059. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/NO0T12029060.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88c2bee57b771dc52f32e99b5d83f2e08b9a54c52143e7ffb9428cf6163d8ca. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NO0T12030010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d22e81a6006e50743629467c2fc4a1bb2e0ad8b3a4660c2cd9980f8fe8c575. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NO0T12030020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a0ea30b308394caf090a551ee321a2286a9f7598ece52e9aeb3d96601de835. 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/NO0T12030030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd934ed7e8857a96c803018c093343137b33e9e1c07398b8eddd0e9214a6cf2. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/NO0T12030040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee0b6ca956cad4c012c556197355803f0cc481a2ba3ac3b7267114b8d11990e. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/NO0T12030050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9c96d7ef858da39e946cb5b99c2a3e900625f6a6797266713c67cbfd70ebf2. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/NO0T12030060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47075996975edf0dfdfe3bd88141be09ec3d61683b1c339b8729aaac20a28603. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NO0T12030070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d67624df598027c9af3aa17e5265cbbd8df38e4d1137366511c57ef38fa819. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NO0T12030080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ec62481cb48b15f0616cecc593b612ed886dce28c75c6a03b8dbe25b3779f1. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NO0T12030110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67808462941f5a8e0435b06020678ec5644343b18d5aacd6909b3b0adbc2bee. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NO0T12030120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e086d679798a2b03196186dacacbef3eb846b10bd971cbeedcc61c2757340b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NO0T12030150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2764a57b7314602ec24b3f294c597662219d3b45c10b4656b4eb8f82e2ad20. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/NO0T12513010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d24fb2e32158be195a1f6803cf7b5e8b4413a67c0db7b118d1400681c26f75. 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/NO0T12513100.