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 0x21969bb03e9fdac9637bbc1099afc757be24ed08c942174916b679ea61aea549. 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/df66a664-fc2d-47ed-915e-a9d4c4725233.json and https://artists.proofprofile.net/proofs/artist/df66a664-fc2d-47ed-915e-a9d4c4725233.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 0xc74acd6378c8716e626b9f060cfb1f26b31f4cfb115681bda8ef84e0bd3cb7ac. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6K2225268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404473fbd5a455512caa7c123c6818b08f16f2bc451cb0baa10421365e5faf4f. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZMER2254820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf980924bd30e933c7dc701bf5891aa535de2b4d4f9171cad5f62205cf3fbdeb3. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZMER2254821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50675c7219acc770385e6d5d4fffe3bc19e286a419addc7ff8b725a0b0f55c4c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZMER2254822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef97bcbb117d0a05d1fd62257bdd85c5e8e5d085d611623edb2bf71bd131d6f9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZMER2254823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dd1172e01c12b3d6ff12c39b544f5473eb7839be4d068d1189febb4ba0c784. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZMER2254824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df50920d0316c34e0ddd50f25f2191506b35ad13e3c491c23673b6b2ae9570f. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZMER2254826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d71ca8952de0cef5410a2f772d8644ecbbdd5f2166a11c834e6ba12d81233a. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZMER2254827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5498668b91250afe23cf961389d51df647b83d79ad845c227a2686993e1643fb. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZMER2254829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4592d9d26a9015907f4bd8bfa199417fb22bf1d508b1f6e5c8426888f8d8db5. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZMER2254830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ca0fe02f461402335a87dc98a6f51210d201d6e178b18aebf53ddd6d8c060b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZMER2254834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9676e6db4ab38275140188c85d61335cdb7c8971165fa4d20f37a32948648a. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZNWR2298038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84ab3b14e1b932dc932ff6bfe42b2d06c99f1c96f90fbd7526bdfc60795875c. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZNWZ2208170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf5f589a45b0c1381f839ae5badf2ace15b9d8b53046f22e85df9e7ae7dc0c6. 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/QZDA52376589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865bae6772842a4ad34c61052c24b84a0f9d8cf72d0de7ee68a9ade59deefc18. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZDA52376592.
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