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 0x5f7d9e3ab268e1ef47c1e8dc6e12876645cef760ada865b1be11897de1df0fd4. 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/117efd6c-dcc5-4618-a676-c01e02ebfe45.json and https://artists.proofprofile.net/proofs/artist/117efd6c-dcc5-4618-a676-c01e02ebfe45.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 0x90dc6cd9b339b2f8b5b7a3be655b02574adf85f1356637b88a255dc372970748. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/AUNV01500467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0c0337e551e5a7d27d2656abf1735310fc391b07b413a603ee53e6a14c3876. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/AUNV01600516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad9bb9350bcfff6570abb4b8ae90333cd556ad5990b0284113dd923808550b9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AUNV01600520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0687c83899a77801bced6dd2b9f83696c9b99b9c01e8aa795bfa45e1b81337f5. 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/AUNV01600521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7ac819f1feb08bce91e96d5f61b7fe9effed8502f51af4f1bc1719be8b5692. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:43:19Z), 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/AUNV01700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fa66e28de5e08e9f3533c98495740753a186cfd3639ba6ce3d63cd36acbb64. 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/AUNV01800468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37d78f8285e81eb362145942c10215e749828b477ce46c3a3db9d3888ac917a. 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/AUNV02000069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aee64280dbaf4a77b9fa4a036f5b5c43841251a12dba8dfb17e7e624c8304c7. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/AUNV02100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec73bbd821e5fa1afd4d9718a058de19f3671dc6bce9c183c78cf7f5e8817da6. 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/AUNV02100235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96a3045a03e42d5da3aef462001f37ae3a660653e9ca5b074e73590ef1eb856. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:44:56Z), 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/AUNV02200044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18d359f1c90db16b105bcf0830b1fea79936ece0a7fa7cb577a9622db97ed14. 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/AUNV02201125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66bcbceae6b798be22c0f4c2d613b5ed6e96742c5f4357c6bf3f7c9b7784648. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/AUDCB1702315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5a559cb3daeb56587e5d74029939151f3a23af51e2e4832d0113633f3a9d2c. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:29:13Z), 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/AUDCB1702426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6f8b0c30d3611f1536e55b211c97ae2e8c6e79a386bc397d945573bc56437b. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/AUDCB1702954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6f8b0c30d3611f1536e55b211c97ae2e8c6e79a386bc397d945573bc56437b. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:05:06Z), 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/AUDCB1702954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2687e40d38e5d12a08216d6df5da930f42ec2d4b3b933b25cefe0135a6da6e1e. 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/AUDCB2500005.