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 0x89447a47ee8d01940abdf1d98da7629245e0427cffffe9f40f06c3ed60ad5f61. 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/8f1b29cd-5bd9-4735-ac62-d6b6d5e1cad7.json and https://artists.proofprofile.net/proofs/artist/8f1b29cd-5bd9-4735-ac62-d6b6d5e1cad7.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 0xf672aa5dba609cac05a62b28aa0481da50427505ac665fd3e3b85f9b80f43be6. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNW72229682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9529adb73dfb765ac7c2f8482e487e2633f099a75e77afd301b60b3c800e6b41. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNW72232141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44d60e225b09749107a38cf3a80b5c7c56b3d0294eb142bac65e89cb9a21440. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:09:11Z), 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/QZNW72232142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336e679e1dcb66481908705eb7e3555a701a1180411bc2364aa6f830d62cde1d. 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/QZNW72232145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf12f28bf98a3407bec2054649a35b80e497cc66808014b97273fbcf75c67bb0. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZNW72232146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eccf3ee6f8fb1906bd2746a44145514aa001dda0aefb1793eea356b1a31ff97. 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/QZNW72232149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988ec2995380deadacfcc00aafffd655c80876ac4089db5da3407e3182627d21. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNW72232151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640180ddfeb4db1cb87da1bd9d3c117fa4389d2993a996e4747758df03cbd416. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNW72232152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eca471f408dc67678e3ed10bf2c9fc46bfce9fba90de9f0771b1a52319c8204. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ESA012298336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d8c3c81292d787ce3dc7a8a828087111cadcefbe34d35e0dc7aebd95ad15cc. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ESA012298345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8d5394cb0a7a5e3a8d3e4a5052177fe63e5a63f6db7f735b26147f0f941b45. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/ESA012298346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8488a5fb325dd5ba23d2fece6269c1663a0f93603bd8a5e67f7961d94fb8c16. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/ESA012298348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6971ead7815474c2c347608c9409d715636be45a1762cde05aa8274dbc6550e4. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZNW72220551.