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 0xbaade46e06324fc438710095e5ed3cb1e9cbe81170a7d014afd945ea5fe94cb0. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f389cee-7ba2-4a7e-93f3-810894dd8eb2.json and https://artists.proofprofile.net/proofs/artist/9f389cee-7ba2-4a7e-93f3-810894dd8eb2.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 0xece9af09f71650d201687e1c64ac6dd6b14e035ad9920a08deed631ffbc9ac41. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWCC31900725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c70d7fe8c82c2c4a511cec0eccf76fc93119c16fbbffc7c4abc4a0625fccd0d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWCC32003708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa26c0e51ef34dd0f8ec417c06ddf32ba1701577b070556167ee3583eea84efc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWCC32005201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa26c0e51ef34dd0f8ec417c06ddf32ba1701577b070556167ee3583eea84efc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWCC32005201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd550c32a5b5282d3d3b5f6a5e16eed3f1ae92ba09bed9f042bcb4a8cdfce2583. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX282361303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd59d3aaa324ed82fb3174d4aa6f2280dca005bc7dc18bdecf93decfda5713c. 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/TWCC31901954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb97c15e2d0105b86612c37113f065bb4aa6849b70a02cac07b759f10932d2a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWCC31903289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdaf007dab267adef417bbacb01c7bb82391267317cba41b75e8b799d87ad62. 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/TWCC32001200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc89d2d79660920be0964b0164b4e82a1850d6b5e2f05733d6068a5f4be71153. 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/TWCC32010220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8009632170c01481c8c23fc67b5272ffa698071fbfb91dc66db2308238fa21. 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/TWCC32008132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e84b22f0f4cd85976a8dda879b6311d4cf0f91c34870cdcfe0fbc3f797b8eb2. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TWCC32010222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38482e0fa37de79847515bebf3fbc2ad62a30f28c227c60d98629f911f092555. 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/TWCC31906539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cbea125837522118d2432bbed66e017471602c584254b7c5aed95c20ec55cf. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/TWCC31902977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4c3f103accefb0fc00ebecfd6dea31c0d3b51e87a8515832235654e7bd1877. 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/TWCC31902528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd493fa5de39cd7d40e45cce4bcb8359cc76e4758714a5532c1b1e11c7712249e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWU712303705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3561a931ac70af53de19a1af04159b6d3816b9c1ebce9ccb57fab798775f34e1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TWA451710022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c92f179399b55a5a1889136e8bc8b0fad92cb925375eb4b0fce2fd97a1582b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWA451710027.