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 0x3771ca4b157ae6fcca6c75c4c6b4d74bb3453c28d38bfd1a8b66a77944da965e. 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/3988d329-8efc-4970-9125-7a78ff371c97.json and https://artists.proofprofile.net/proofs/artist/3988d329-8efc-4970-9125-7a78ff371c97.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 0xe4e8b07e8df1ed3d680e6718d412217556be69b9aaeda0f96662dbd1ec57d296. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAHS2353942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dea7fc2a5e3be2bf15fffb3b6eb5f104b823ee2d62f5768dfc195d90b8e6dfa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX4R52450253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fc007b625c62abfdaccc124db56f56179b03733dcdf8b38e057954f93b76e2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWV2469085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b34de4da7ff046dd9aed5ec548007a734edbabde5a8d5b4409d2c5e27782a21. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX38U2430423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6fdbfe7d1c25bb3c7afb72edb3e473d6acab7775e4e93b95f104b76417ab95. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US38Y2408650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dca6dae446ba94262629dcae958ebf9c7f8eea948a5a19ab1532542fc694b8a. 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/GX8LD2488729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b18aca018c349b95efae2ef01fbdce6fbd77e17ff7aada73a2924d1796d0584. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/GX3HH2313851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44af7b82fe79335685dbf30d6e03c6ebc2613d54aa142761af3dc945a35d9026. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEVU52394626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c91f41d226b417cf8cbe083c171b9afe0c95f8201b1bee9acf6a01dcee78efe. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GX8KD2382958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea0e000eea72a15e1d4c35c64b712c939f80a80789033f86900900abe61678a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GX8LE2219008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdeee76c4062130c8ea7ac92d2e72b49dfdd664639f3763c478c6f54c466d29. 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/QM4TW2207865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07fbe3478f981ba0ce8391a13c4f4ea47d281a13b49dedf1cc4b466393d289f3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QMDA62188710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6689d6180cac9d18005d76cd8562d55167ddc597aa1cd4805b7281ca04e106ef. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMFME2489875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf080d1df327d9253bcb833e07e448f4bf8feb724f78aca0377f4849d3224c7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6N22582226.