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 0xd339850df611d8498e6880ac7055261e271a0e6efbd44e4881f4f065fbc35009. 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/fc4afae2-1dc9-4f4d-8446-503b476c8d85.json and https://artists.proofprofile.net/proofs/artist/fc4afae2-1dc9-4f4d-8446-503b476c8d85.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 0xf3f00bfdfe9a8783b447fd0966d370d7eff16482aa81692f56cb07492b0b9a81. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/FR3R71500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29161a11122dca86592b5181a7feda330f5fd2e0ab7fd78716bca66a8b5a061e. 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/FR3R71500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adc7e1740cbe464c125675279ed1038e72c47a30c57b98fba0d7475265813f4. 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/FR3R71500110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596c95e733eb9eaf0930868942cdc0d8d2d28f08a76754052d8280e544ca6bd6. 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/FRD4V2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa923e3d8668edbc381d1f65d14ace88d15613e7e9c266146b8070ba32a0a9618. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/FRD4V2000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51df4f879f929a4be36f23c1a9cf0b5e436452c54c4d4cf06efec3547a83150. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRD4V2000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccd6dd30fef21515e460e601699bda092175a54ab32967322dab95590f7175f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FRD4V2000070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb2fbac0035721ea95910c1089b84cc4aab9a6043dd81f010bedaffeec66826. 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/FRD4V2000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66d820321660fa8acf47343fff7a1174aa2ec19777c3802127a631a092828b5. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/FRD4V2000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20bdb6744a06f6679d550b57dca08b4dd2166f819b7b529549a609520685298. 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/FRD4V2000110.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb2fbac0035721ea95910c1089b84cc4aab9a6043dd81f010bedaffeec66826. 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/FRD4V2000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858f942b475df7dfb8ae77d5503582d90a612cd069d7c852fde6441b54db3603. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FRD4V2000140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47985506a66b3caaacaf119be38679baa64ac35a88230b926194e2cc8bc4ae4f. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/FRD4V2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06446c275bb0fe9aaba6b4314cedf6a5ea9cc68f6006cf15823d8701457742f8. 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/FRD4V2300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b9d3bcee9dbac0046ec5c58265c428842b2499892c1c78f1c3f91e759dba7d. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/FRD4V2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72142e292c8ca999d4a7ecb0b4555eb2ee1104c2a54908e3e7a6c4e76e9bc4e. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FRD4V2300080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeea8be0a3a9a4c30cf97cd9d253bb43f98e8dcb2f01eb9aa57a26a6247e444b. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/FRD4V2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae462e1ccc4ef6ac03f4aa044f8aadf4d7d6e8874f3a6c0a3d8f6a301dba0d6. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FRD4V2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238a2ff986f4ae97449cbc428fef0f7b58edf79f570ea46ef7cd04ce0e3c388f. 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/FRD4V2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ff74392c011b1d197d205feaf349b39fbc6c8833bb0631786f20a0360f0a03. 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/FRD4V2500010.