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 0x6b72b1c9df3d6eae75c8f523eb604acaf875d3c6405ae27ebb2713620eeaa5fb. 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/d76b56e1-0243-48d4-bde1-8ea418b36bbd.json and https://artists.proofprofile.net/proofs/artist/d76b56e1-0243-48d4-bde1-8ea418b36bbd.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 0xa6d5dae919a58a6571f1c1ffef9a9eab9168b948464b4e9cb9460b36aa4aa1c4. 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/QZ4JJ1958966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745ca9a4121630cee54ccde7186e95ae3d9ec53c2d649a7b3715399c544183b1. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDA81955069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25950d99ca5f441cdb461e6390b72fb7d9ab50aa1eaf5271c747e44790edc38d. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHN71993564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb98b1a711c70be2343b0dcf7810d9a56c09837883d87784159b828a01b76484. 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/FRX282157705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47dc4a20a8ade7573cffd8bcd7ca80a1a060d14860932b7e446465329afdff5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZTB22237824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d86ea94906a484499fe2953efc0267038727296f81df73465d6cc5eb4b48d70. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FRX872341925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97174b7d396cc00341af4744cf56553f6c7be523a9f6e39a6ce5e01c38aa1e7f. 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/FRX872341927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf2663f20af9fdbfa0c556086273830931d46e534f874f1a8585aae47a7e3d9. 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/FRX872341928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb047e3cedaf224ae997b5e351be7692e9d8b01f243fa207b36b774e9a9831d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/FRX282405151.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ff7a8644aa53801469b407c5d8baf673761275d532762ed690f880f15da350. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/DGA0S2442098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8821423d4634f205084b471b05f7e1d611be845d3b4033858cd87e36611fbdfd. 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/DGA0S2442099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8bd4c38259077545a4f8d1952b6f71f256fd5095d43fb2e4dd8410d8bd0d626. 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/DGA0S2442100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908f8e5b1fab6b620ce325298466756a4fe4800752e4473c84dc67d054d9b694. 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/DGA0S2442101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9c55df879f8013774272a6829eb8e5aad75653389e83ad54844dbedd3539fe. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/FRX202574729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217cbf49d49cfb12dfde587b271eb85c23518b471f45c88e03215a75d11afca6. 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/QZTB72507476.