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 0x44891df3554512519dae7a71f3a718bca0c7884c6695771d484879b94041c8b9. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d37f417e-dca6-4164-8f9e-15d19d38dfb3.json and https://artists.proofprofile.net/proofs/artist/d37f417e-dca6-4164-8f9e-15d19d38dfb3.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 0xf6f2230375522fdb69450523603894d43b6411c585bc87fea722efc707f52237. 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/TCACO1672653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e98efe97cd6d80b0cd49f153cd117f64dd8b99d566eb628e597a274aca14fe. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/TCADH1738433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c748f0fa90e6aa266a08becd15f0300f97002fbef379a01d0f884d6d4b8951d. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:39:18Z), 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/TCADH1738436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61c9c67fc50eb66e43bd937e37819bd4fd118a1fd88ae5059da7f522a221f4a. 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/TCADH1738439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6adc7d04621353254cf8ef9ab74982d097a46d977d4edafdf9c2c734ef4dd9. 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/USUG12303549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf575be0033e5edf1a2a13d76029ec243173e633616a3ac824baae96ce2e38283. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USUG12303545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c6c9637ad7e7a323335f2eabe252cd721108275a0ce71d63e8e3262f43aa9e. 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/QM24S2500957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f3b72bc9111bd18e7dfe17770c169264228e08f8a058776a4569d2b977109f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMJMT2002653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d6aa838850ea65835515521ddad1846b6fc37bdd1a0d62f7dc6e2d4c9ce865. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMJMT2002684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a2900000a0adff2773e493c1ed76447192e6d3a1122c32b00c6ad9aa6962ef. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMJMT2002686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7751cbcddebb80135da077dcc9e2e89027416db973387db58f0988aa30cf81. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMJMT2002687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94a80cb76e8de8fb4cd253043f1c5221313b2c00c4b608e74a1bd55f14eaa20. 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/QMJMT2002688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba5e8dc4f06293c4d4e6146ebb877ef2f70a884bd28a7028e4c210cd593f1dc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMJMT2002689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4ef1394cf357abf13f56f178dae3bf864107f4555ab031a3f882442f8f2a99. 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/QMJMT2002691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6a5318c368def1c4753a86fca43e3a5e613a88ac7cc80823ee522e5510e78e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMJMT2002695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ca57b340b369c144ce70495ec4f73f1be9ff27d3aebfadf6b3b4d2ec7de929. 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/QMJMT2002697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4099743597985efa94919e3c3e20eb268f66793408fdd52adcba23a76da669d9. 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/QMJMT2103947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f3b72bc9111bd18e7dfe17770c169264228e08f8a058776a4569d2b977109f. 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/QMJMT2002653.