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 0xcb5f32d99c39dc1b55ba3a3e8036295f29527cea6d8a508478224257f4121496. 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/93e5b2e8-0290-481d-a155-957eef087e56.json and https://artists.proofprofile.net/proofs/artist/93e5b2e8-0290-481d-a155-957eef087e56.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 0x5f79b030f27864a91836cedd22777817fb3b93defdb499df5341bddaba14acd8. 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/SE6XY2214976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af2f99ec5aeafcd8da50dbf9277233715452164feb50e5020e3dce371d3e752. 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/QZW9M2319083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d96ca7964d4e62b05fbba80886e52ed3aed67a04da7380280bea9013ae4093. 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/QZW9M2319086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574b78f7873a37653f751fd9cf04f112da16415f0ebd70ea60ce32e314a4d34f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZPLS2119252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d7123e5104f95324d4b6f5151fc4d5b58babb7634ff47e08c4c8958218bb16. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US7VG2114284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9219dd2978593bd119ef3c09c9bdd236a20260b33718934f7cc1ceb4da1de7c6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:59:47Z), 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/US7VG2114281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0a7036e92614f772d7c2e7c45744106d53d21b729ae93614ca68bb7ec9623e. 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/QZDA52437579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe067ef685d6fd61246e34768574cbc21617b5636eb690b3a1430880f1171b199. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:00:07Z), 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/QZW9K2340830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5bed6320149b09ce12d578d8d40cb242e573695cd72deb5ce31b92f12c4bcc. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZGLS1904842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9709423e4513a5702521cb21cd0cdec2cd60f031b212813f3bd80230f026d3d3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:19:58Z), 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/US7VG1824075.