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 0x990d770311c20389d1372c13b9206478d9be3e1bdcc84f81dcd51e5490e723b0. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ead8913-565c-49fa-a165-c95dc397bce2.json and https://artists.proofprofile.net/proofs/artist/6ead8913-565c-49fa-a165-c95dc397bce2.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 0xce2b260149db30e974dd7af05d0dfcd723de95fb0ed00e59f42d54528b02e51c. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/CAMVR2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a42b9582d875f3778154c21b50963f119027fbc0b7f135f5d607a90b72220f1. 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/CAOUV2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c56f4df06c2d2632e097489ca27b41329b1bd837bf8162221d0344ac2ade53. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/CAOUV2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bc506887c7ff2d84fbe4e690adf5feb68d752cc9cf8f46d4054774e97a1fef. 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/CAOUV2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5843758031ea2ef8d098257253248b9ca31f7932e2bd4f1a07a964c38c1f86. 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/CAOUV2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cca2a85263cfe10ae1cb5788046a4745f90f17a9a1388aeba39b084226d11d7. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/CAOUV2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174c09aef3325b4cec27e477bf58ffd33c36ef725457e8186efd82969cd542e4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CADFO2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc566bb13648cd000d89239b0f0a79770aa38fbdab8ed074f18803eb94d93387. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CADFO2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f47eb2cffc6f33010e3e8ef20771f9aa33b47a8b2996d2f68cc2c516ab7d9b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CADFO2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cbab1a591676eae34c4a80185b4f2c6b8226187fff92b2240ecec0deeeb4a6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CADFO2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a30c04111bc6b9626820d15937292cdf50cb8b8711726bb713e8c5ec0c8a2b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USLZJ2149502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174c09aef3325b4cec27e477bf58ffd33c36ef725457e8186efd82969cd542e4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CADFO2300005.