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 0x35271817ca5084511afee1a8cb2bfc61ee2c7827321416ba8fcbb7470d79574b. 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/4d0bda58-51d1-4a00-ade1-9483f6ef0964.json and https://artists.proofprofile.net/proofs/artist/4d0bda58-51d1-4a00-ade1-9483f6ef0964.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 0x6c295cc6c08e50dec70cd59cde11fcfbc21cdc2350a13e1bd780c586f9f4005c. 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/QZN882237849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ecf346eef3a40a800368a665989e19fde29357b690b7b10b6a6008bd3f6edf. 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/QZN882279399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5710c13172bf3371828a1ea4e4a73ff95acc8abddb8d2705284e3793878282b4. 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/QZN882279400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e28a8d678c0724927b32ecfdb0848df51ae444eee35fd70a4a11adde39dd42. 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/QZN882251209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e02ef0c6fcaf3fa44ac10ec5e1bfba4607674dfc874bdfdd0494d47e53a2d2. 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/QZN882229823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ad1ea0bf24c36ae4a745469d74049413eccd74b94da0b5c3e1504a271fb80b. 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/QZN882264289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5766d8f5192c3ee5e90e3274b3b95a2027771591c03c66089c20d4b7d611e4. 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/QZN882279401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a87a3bca0db5e8cb81ce7113889d6a6f438887357b836acd169b88e81d62d7. 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/QZNWU2428809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087cec6a8dfa95f9c2423d1e0d4d1f1284bf6b2c18e9949889ccf85e613b0b93. 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/QZJ842400189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cbf494c1d378a8cf908cd7f73fe90133df5fc83ff73609dfdeff9577f2d204. 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/QZTL92497979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ad1ea0bf24c36ae4a745469d74049413eccd74b94da0b5c3e1504a271fb80b. 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/QZN882264289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e28a8d678c0724927b32ecfdb0848df51ae444eee35fd70a4a11adde39dd42. 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/QZN882251209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c295cc6c08e50dec70cd59cde11fcfbc21cdc2350a13e1bd780c586f9f4005c. 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/QZN882237849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e02ef0c6fcaf3fa44ac10ec5e1bfba4607674dfc874bdfdd0494d47e53a2d2. 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/QZN882229823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0884ab623d7f35f5b0e7efabbae6db9b8abb3174bb03ca2367afc5d565177b. 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/QZK6K2129419.