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 0x06a8e33eaa85b625b8f1bd101deecf332ba0f4bfd620a750c42cf61e0ffaa688. 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/e4ac0958-0c1c-4250-9e47-bf1ba11066a1.json and https://artists.proofprofile.net/proofs/artist/e4ac0958-0c1c-4250-9e47-bf1ba11066a1.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 0x662780fa1669fb71a3151002606ef77007ab52a80245ce43185165aa6b91af3f. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZDA81815409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508faa12afdd2e2b134df60d96898c36cc679e3b929daab0d6b775071caa4e0e. 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/QZES51800271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060af27d4d99a36c81e014be3d3c5435ba8a0fc7420ce92dc3c636cbe24224b6. 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/QZES71816020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa074d2c1d5145dbda3f666f6ee3955cd60317c1f4b5a01cbdfb8ba71f4e87387. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/GBKPL1934274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bec930c6ebc1b675639f7a652dd980d2b5bf9746e17af75c65dd64fbe6422b. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZFYY1957117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654cd5bcd05264c5c73ec55763b0518ebbdef855c7857742501cc249ac4abd8e. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZFZ71990856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701663a23f4f37ddd04f0c73dbe5c3be28e53eb348bc3aec6903773ea694424a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGH2018725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edb0812f6eb0d52c1d25a0ae1253a37dd20b5b033a7e59e835004e8897bef2a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USDY42069891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6717e0df60ef64181f24b203f7e8fe426d1eb3fc6b307df0519f1c95bb10c7. 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/UKFGV2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba8867d753d8fe121378e770892ef8b4d162a04df5fc95fb56c0d85819c6604. 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/UK4MC2100195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a58b0adaa6e3afb9f085a3330de4744088edaa13a44fc8a276f622f7b55dcb. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/UK4MC2100197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a65496b40170d26fab8383d867c632806e1d12409292a31499d83d7d216151b. 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/UKWX82100473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9798fc5539158ad07fa5f2d0e26d4d3cff3676a3d74be9779d3834b214e59cbb. 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/UKWX82100475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ff17242869a9af6b26bc9fb2207e460904a14d6e9f8657f173e8db5d578208. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/UKFGV2400083.