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 0xa5de583824daef57d8b6100cd3de5e6de78fb0b84db48665b0356a9baa442800. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a67ce0ce-702c-4321-8779-a6d424f1b56b.json and https://artists.proofprofile.net/proofs/artist/a67ce0ce-702c-4321-8779-a6d424f1b56b.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 0x4ffe1dd3c167794dcab18df477f8983e074845a4a690933fb13963891c6d099d. 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/DKPH21800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb104d2330fff1b92d8b4114215eb5a2eef28dc567c83502922e9f005799fd9b3. 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/DKPH21800105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd8640db3d637791388e1e57ed637d7808f28fb52c0b87db123fe47bdf83ecd. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DKPH21600201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e6b6098083d3e5b999e628df634628044947fc44fc16d62511487a6a8334db. 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/DKPH22500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905b8adf888cc72cd0d31578028a96c9deca4668a5d472b9807eef05e145c324. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/DKPH22500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8c923b310b2d7950409d769e8cf3562a00bddd006bb392abd3ba3f5a036778. 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/DKPH22100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc296ce2be5963f0dd2de0642d0953b0683f2ec7d441b9a68ac436f6a62249194. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/DKPH22500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dab91c9eb1fa5bf9d1fde417f13a3c4140ceb38654149074d71a51f430fe2b1. 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/DKPH22500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905b8adf888cc72cd0d31578028a96c9deca4668a5d472b9807eef05e145c324. 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/DKPH22500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd44a9d905a00199f7299cf0326ab7e1a307cb4e22e8f35f4f71f751c3629eb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DKPH22500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a8d1bad8b22ca603c4d8ce7bfe585bde39e9d9b755a63fdae4d7b3913c8e85. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DKPH22500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884c8cdf62268779605c73a5fd5abc7b1bc206fcef2a6064bff88a79c90aa814. 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/DKPH22200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe476ea2905ca8f12236263f00729bff93a8d845ee902f572cf3de6a7409fb52c. 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/DKPH21200107.