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 0x172a5cc3db76baea4f1dd46c5adbd850c406eee9e9df4306b7306ef1e45e5519. 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/dbc0fc2c-5af1-4502-a29a-9d3e69cdce8e.json and https://artists.proofprofile.net/proofs/artist/dbc0fc2c-5af1-4502-a29a-9d3e69cdce8e.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 0xeac6b600e77e028bcc2a39520b88f6a24175faa7eb38b8b79a6ddb1331d56ed5. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/FRX762085192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37e064d1ca5ace5b7c06dd271df1d7e1c0c82f225ae90bd985de7a645100d02. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRX762085195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc705fcb54c53cc77b2f445fccd788edf5605df6723955d9a52d89da304eda7. 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/FRX762085206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e75ada66f4364c6e9534857bd01bfae0eb472096657edfeb37408ef591711d9. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FRX762088635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5f41002caea64d9126574940dcc7123b8f4312f075a5191474d4f109d4d834. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FRX762088636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dc7aeb4a7fc07e5674f754658877958f77ef0136741936d1a8c6852fbbf34f. 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/FRX872007347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73b3e122bae08d89e623ce3fe8af8d412a2abde329bfd2dfe96460fd260d927. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/FRX872007348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ad716c8564a9db186627a76072727e604f9d46fc6c4abebd65cdfc55f9220. 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/FRX872007350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13323fccd0af948e4b3199dc31b7cbb250e52260f33bed0f3b34a4170f4a040. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/FRX872009650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0465f23bd09891c4e56747fa65d78fef4d74abc08bb9fc80c8ba7a8547466788. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/FRX872021970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cd83bf9b9f52ef5f032acf1f0ccaaf125f9596d00eecaf118e0b136ab07a42. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/FRX872007352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397ce62069307c4ec6192e2dc4e49656e91ae8fb7af06fb6db12776799484f8e. 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/FRX872009654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580b246379f3a98c5a5cb2b968f2f1b031fde22e972ae37879d2c2e99507a585. 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/FR26V2085770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499c32a02dcadbb8e43a118fd058c7ec021c4dd548fdf65a2f5dd1f6c10fb86c. 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/IDA632311944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db9153575db469a3fcfda44e8a6eb574bf01c1591f2c780e2453c8d01be38ea. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/IDA632418565.