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 0x656b0161b6205fc6756cfa6dfbd26bd1e598024c269351d329dfe36f9d8c3d97. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b17767de-eb79-41b8-951e-29320a026a54.json and https://artists.proofprofile.net/proofs/artist/b17767de-eb79-41b8-951e-29320a026a54.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 0xe62c424738de46090d4f19ae59ac86228a762e4e21094814a28553bf1bfe0eca. 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/UKF4T1600074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0236c21947af47028aa170014d6f3a8a2374d479603974a1a71255abb2d368fd. 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/UKF4T1600076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d10ede94f4f68ec593739aad428c16ba4bdd56f9799acfb3c7a69a1df860c4. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:26:17Z), 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/GBLZC2300069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3f03e16e56eb457b00a8741262a241bd2a1763b99405c86dc090fc702fb65e. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/GBKQU2438352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7bf2eabe3bcc4f20dc01165108315ddf2305c5ae790d26770370bfc2e7b857. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/NL8RL2505927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7bf2eabe3bcc4f20dc01165108315ddf2305c5ae790d26770370bfc2e7b857. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:26:32Z), 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/NL8RL2505927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00abf9c6c78f1d0c20f01f772e0962f797b7e169a1a7277f7f3e570bfc512c88. 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/NL8RL2505928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7883c99df63ca2e9d99e8b44dd62eb8b5c7f7c690c779b95bbc878ed58ae90d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL8RL2505929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfc74cbc95b61532a1dd99c76a70212bd97e073884646d69c7023856256fdc4. 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/FR26V2018854.