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 0xac9d54e19111c6d0524f2387c8c7bbc817d7ba387dcba6f69e9cd8c6264775ae. 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/19f4c607-579f-45d4-ab6a-af6978b5ae1b.json and https://artists.proofprofile.net/proofs/artist/19f4c607-579f-45d4-ab6a-af6978b5ae1b.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 0x90b15269840de07d005b8962a70eda6421dd0f2a1ff0eea65fa3cce24dabf098. 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/QZNWW2018340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98dbc905af65799178a73b6d4ec17465fcec935088cd398aa88a726d4a004031. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHN52174250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd292c111a3e67acf8d928b45916347eb50175aed002ed03927ebf96cfa6272. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN52175957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd921061b1afbfac4b4982933b2b169e00e73957df95625699ffdbd9631abf81d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWZ2174399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ea65f703df281d569b3d31fe516421e1ea77f5dbcccb25318f77d1e8998f66. 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/QZRP52109124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d44ee4dcabb3e4a1ad8d2ff9b9922f37d9ad15cff825b7ded95b231535d4791. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZRP52109125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3be5591ba0be84d4f5d201ef38c72a9d3fcc56c2c8b9bea3f67f9b2d62448f8. 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/QZRP52109126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab839390359a704cc5df44a79a9e65b36640bdc1a47de7d615f0cabe9a34dac5. 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/QZRP52109127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a206d886af541057f5763568cf024c5a022a271d82fa893068c10ff4a254a5. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZK6J2285653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0eac1cfdebac3368c86c784892c70e3ec669a0d4cf9d2458cfd447f87f771d2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ32377151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acb5d67b9ff44e411cf2c8327f3a8d9543958d6ac8808f432feb22dec9e9bd9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZPLS2398112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f852521c05d8df6b192082a24263193904fd702ea3d332fc713b1c829f5e86b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZFYX2476637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9703876caf924c59134d496a0c316a2995ce5c1d824d1ec6f155383fa8a7141. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZTB92435693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ca6b502374fd99cc2cfec01c7ea489cea4107d6514febca49f6251cd1d6a4f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZWFH2436954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc818063e3ac94af474bb46887c61c8a21140b15a53176f0fef29d9c80b3815f8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QM24S2302961.