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 0x1ac5433630e5bb9ea62c037cbbff46321ae52347950fd58215ad6154ebcf34fe. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af5578f8-dcf7-46b0-8ccc-ffc443e54e7d.json and https://artists.proofprofile.net/proofs/artist/af5578f8-dcf7-46b0-8ccc-ffc443e54e7d.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 0x19e63441cfb8d71c40d7c009cc76fa9f53e26931d9fc826f078db7e2aa5b71dd. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QMRQE1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46baa0e80aba1e431f00e88d428a25d1f187288a08aa45d2a6e62ea6c2866b7. 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/QMRQE1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb6cfc54958f6d3ca935a51ea325421dafe615c74190a1c093a630cb24ccbe1. 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/QMRQE1200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0c3733423942dd566a714057f48485298a1bf33b5b658f21dda61ee26fa997. 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/QMRQE1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f61d76bfe2f479beb9960efbc36358f80168eed8eec53887f9c03bfab8c000a. 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/QMRQE1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9c06886f3735cca3a75710ac8f25c64f413d4966e422ac97bdb494ccaecd16. 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/QMRQE1200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54241444b13290f3f5ffcc1ec0f17e285a5e88b0e28996d6f761d0f2d53b98bc. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QMRQE3211801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33949c3e7f977e40edb0910d9f65e3419aa88eefaa7e9b0e4015a6d70fbc3ed0. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T18:51:18Z), 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/QMRQE3211804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e63b3dc70ac316078c3c26bb25b3d84064fec37e6a2895db83b81ea9eca84f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:33:53Z), 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/QMRQE3211808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb3f2e0c00621f674f8567f7cc6f1629f67f8d4a8a43ae36ea7e0030dd70ee8. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QMRQE3211810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c21dec4192b806d19c8ad2b17c46c7405961168be9a2504d059558f38c4052f. 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/QMRQE3211813.