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 0x09aaf5febf3d9dbccb2ad517c84e900ec3fade601f5abf073eeb91cd66afe5d9. 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/3eb0bc50-35fa-49ec-9030-83e20fb5aab9.json and https://artists.proofprofile.net/proofs/artist/3eb0bc50-35fa-49ec-9030-83e20fb5aab9.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 0xb4109590eeb44e20e22fc3151e0b0d691916622bc6c8e03596314fa7eb158d73. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/FR2X41947978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6198b227556d753c95ceee7f9b66944506e7926b58129959d96d7e23710b7bfc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRX202212864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf172f2cec769e9c95cf60c9568d7a2b0914f33dd38dea181b428f8fccdbfd16d. 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/DGA062251803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f52c44a5088576cd1554ce63ef77a87bbf5cd45091637efc09c8dd30713c8f9. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/DGA062251807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2822ed4b29f1e78fbf3363720ac6f73fd777d72dc3b146c9673bf05157312a. 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/FR59R2220904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3668da637dc86e96d94a753e675773241676430c6bb01e618ef03b78fc475422. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/DGA062251810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceea21cffaabf66604cf079e8c24f7fcdb9f5fde4ec24fc3df733d0f437022e7. 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/DGA062251814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8aedc48b3beecc3f0cb79598b021bf01a0facab5451b1ea6708be5a0b2ab184. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FR2X42345434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be089ccf87f00e220056033b17a0bdf88776a08d53eecc83b45b8199bb650d2. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/DGA082347700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677f9e1e4e5f6103881d6efe50f8bdb923033dbb918a537ca9deb09e3c362b7c. 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/FRX202447486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0893ca2f8a5187c8ac6361099ef2eb00eaa55e4e2fb31828ed41e429466cbc4f. 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/DGA062433461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cea739bdf1cb03b68f901b79aaec788b51fb443dad03ac511e5f83cae15f10e. 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/DGA0R2425121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e35647fb4e1b8d088d439709ab29376982704f7da7812cca5adb65cbb839d4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DGA0R2473023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed522e4ab02098e0be76cb4efa542efbd2ed0e70c254a71da64cd8b89c16ad05. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/FR2X42507944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494282ec2a5651c782623e97798840f38581018d2807f3e5969d19322d62c9fd. 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/FR2X42594363.