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 0x486d6d6787bb658dd406bbf296fb690d13efc156303d5f5a257580707d84c23d. 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/599dde2c-a6ee-4306-9f96-aca9bd1f1668.json and https://artists.proofprofile.net/proofs/artist/599dde2c-a6ee-4306-9f96-aca9bd1f1668.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 0x5c8434cbe683975330409b444f1ccd78c9f61e63c35d9dc261df4f5c84c087b4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ISA100101504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263f974a1ea0ea34fb9ef47fdacca1d5abb6d6dc8b686a2ee761436c88c25cf0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ISA100101506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f6607bd178f043372ee2fcb115aac1d40e165f3254bfba118d0a11a498ba10. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ISA110302504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb185f205e695304aac1919cd9e059e0e9c0ce331ece5af3f3bd21617391ff0e5. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/ISA110302511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebbfd1cc4bb0ba2d94223014452f6206ff837c13eba56a0df23d1151cfb0c67. 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/ISZRU1012794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923b612057f1001a68b15aa65362eaf005174fed9bb14c03b97da6fe9ce7403b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ISZRU1012797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f02f3ba3625c6b8b17a872b32ea0c5dbd0cb04b9515a744d4a2b8836bc95140. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/US79T1000874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2484083bfda0ce5412c0b385771cedae5664b3960eac06321fd7e4e781618f16. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US79T1000877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a01e8729be394b77c30f30bfd019d23a249086df2e43f693ac46b8fc70bbca2. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/US79T1000879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4262cbe37bbb235ba18173d8be91363561e9d74c23d1d89a7ac10557a0f261c. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/ISV441620001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf3a138ed6f78020b0485ed2b80fc8a96d77cd2042db6a055bf976d17ddf131. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/ISV442538901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b3c07a5dfb393280888eb6153f767d7abe69c69cdb256ec4252f5beda56e8d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ISA110507110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264af4ee8a95e8e6a6872866b56c3ff8b02311029eca0d0dce240c30fa3c4396. 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/ISA110507117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f366072eb03c938659f84b7ac288db8b8437b94c47c2638f7a02a16e655b2ce. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/ISA110703402.