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 0xdedb470dcd3098db681cd8f2d96b957af324d7a5a761bf0c391fa0dc29aa4e2c. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7055e29-1d6d-4afe-a266-f4b37607c994.json and https://artists.proofprofile.net/proofs/artist/a7055e29-1d6d-4afe-a266-f4b37607c994.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 0x2ebac951511a725b0e1cf279a0c3235a914ddead4af2308b6e4e97d836e038a7. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DELJ81814280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb4358a15752175a86fb702b3ed846e2a54eee6a08285c83017ceef19349875. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/DELJ81814286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6904c0ee63591c2f4d8de25f4d11770dbd369bff21aa2517eb104bf28f860b3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812198611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502e7f92e2f83175ee076072596cc5c51e71def2295180321cf356cc30d68753. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CH7812197163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1edd869a8621e5f120f216ced1701e07cfea52bad51af21e9540c86218afca. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CH7812199369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1e95b1c11519b876d1602708721046ce35076773f8e9d7608e39665ae2b927. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CH7812199371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8211e0c134cea48d9e38b0929c5d2b41fe3c41630cdaafbd7dbfd518df53b62a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CH7812199372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0511de58bfc97c5a8e3ce8521a61bf6e93739008894c41418e3fae91ee75a367. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CH7812199373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aeecdbeda2b0a5ae28e7620471847e7f5d0f5f58fd5ed15171f017985a556d9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH7812199374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fb0510995d79d7f215d099db139358d4ce213e0dd4b02cd4494bfb36f3fba1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812199375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc6f6cd358a527d9912f7940c739446ac485531fd29dbdc28b78ca83430af1c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812199377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fc54d4bd935c1ae3fed62b4ebcaad4fdf2d7659a977fdd73967ba9a6661a00. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812199378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe976ce5df34fea7f63d12756ebe2b6dd73c757b80e0bfed71e7da88bb321b2a1. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/CH7812412208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda27fd2e4668f58ce349b4f1f61cf889a3e73748f828ac150376fe6c61b6e14. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/CH7812413592.