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 0x9c589af893da6ed7ec46ed508d91156c4ac7f16f9128b80242e9fdcf37ed63de. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/906e16c0-d19a-4a96-b10e-8d1672f3d503.json and https://artists.proofprofile.net/proofs/artist/906e16c0-d19a-4a96-b10e-8d1672f3d503.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 0xea957a44c007abc6753724f43b419dbd05cf31d32e49eca55767074fbf22e4a5. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QM6P42592491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a77918d6e28033c2196196bebdfe26dfcb7863081a4d5828df3a4a09d3a92a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QM6P42592492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22fc0bdb084db215a4fb8244a411b6aebd3ba6a61411def623f32cc075f897c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM6P42592493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ecd6e91d4d55cb2487d85c7267c92b537b99e093d077675a750e8b1a100186. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QM6P42592494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b7e693f77133004317ea7c2d82b566e977fee87b232b688221f3ece4be0ce1. 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/QM6P42592495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db5b1f67eca76ed57c0bbe39585f043f6c9f44234a2f0057494258653ac0e09. 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/QM6P42592496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51b56ed0e5f9739e1f672192d94661bc5ba7167fe05c5e6a04fead003332f23. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QM6P42592497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5bc5d1aac23c5f5e6167d273f46610071e68f304416af11a704d688b3232be. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QM6P42592498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd86f2740afa1c112acb640837e8a1a2d7a6e2a72028067e5c8d1f6ec19a2c8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QM6P42592499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2932642344bf37fcf11842e3ee45b3be19e1e18c1d9a96baba1b26e4db9b573. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QM6P42592500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ece7466b5ee4a666b8f0b4545d250000facaa7278d9ceb68c159dee54362a2. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QM6P42592501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82ad35feabae30f7b5823d9a9756f810ed020d9ea5f35b4f22af9d125aa566a. 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/QM6P42592502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bfbf75447e38ade5804d41aa4d0b20f60334fb3bce15005947b9e22ad33e0a. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QM6P42592503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d2d2acdc3a72b33b244671bfd9a86aafb9217986da6462f2f8f112a034f89e. 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/QM6P42592504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d70ba2104bdedd463d26c0e4a4c65d7961f09e52aa6703ea6be39ea853f1be. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM6P42592505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6a8a3911613af28c28b85ccebb9ab139d8246e6e96b4b07aa10f959631a272. 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/QM6P42592506.