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 0x003bd21599213755ca9c527f8ff7be437d96ebbff6858e8a9e7e2f8dfcf11ace. 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/df4e9d0e-aee5-4f3c-9b01-d6e63fe00475.json and https://artists.proofprofile.net/proofs/artist/df4e9d0e-aee5-4f3c-9b01-d6e63fe00475.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 0xaf0fe62d0acdfeccbc5bea671c8603ed4fcc1f072ea9ac8071bd4af0dd441213. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/AEA149001546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea43358edfff4480794c417784717cf26ed32a8b48a676aee4035ffb60c35c6. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/AEA149001527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05228febfd19a1522de82fa914e15ed8f43bdc5aef7d1ebc82757c60dda53fe. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/AEA149001479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8e667ef592bf9978549a3c24e57d47222292070ad4d6e053baea12b1d27295. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/AEA149001526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a26ea88714fd47d96055e335909c3731923d9fe267ed59487c1a8d2dc5e15dd. 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/AEA149002057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e8f6b1c60cc685b24b546048a264fba523ee13135c2a6f6f2c0fc6abf84b69. 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/AEA149002058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a04af29733799276ff68f922c713fdbb3bac4cfb5748764df9203ed220c65b. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/AEA149002126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a15722c7cf8fbf6a32bbc5bed31f85515ed72862313e5b6af421efbcc8024a. 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/AEA149002127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b37939bf69f8ffaab039d47d9058cbc31c78954309eecf77be7d757c82c682d. 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/AEA149002128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e01eb6e03f3bdd425b38881b1073415910ead404abe72c95e58ec1236f9e51b. 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/AEA149002132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15e4d8bde959666cd10ab102ca2fdb0e1d23c1c80af09bf4fb89dba5836e72c. 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/AEA149002156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d300fa19d463fcca4417edabf73cca7b5a3e54f1b84baac079c644f6ff0d8d8. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/AEA149002162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884765b4d8aa7d339afe05db80a8b94dcdb78f1319072f3ddd1018a032e4bb16. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/AEA149002163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bedcf19fe1029fcc14fee4be31ba5b9944b50e758f84fee623ed8b913878eb. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/AEA149002170.