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 0xe66db130212b34d160ef2e5083a69215567f37ffa53d0dfdb3e0b11939aa8e3f. 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/bccc3a1f-bcbd-4d26-886f-43ef313ff20f.json and https://artists.proofprofile.net/proofs/artist/bccc3a1f-bcbd-4d26-886f-43ef313ff20f.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 0xb1c76deaf6fe1cca3407fac69ae26f0fe6ce529081a4d6eff98f9607df9415b6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UAMM12100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c76deaf6fe1cca3407fac69ae26f0fe6ce529081a4d6eff98f9607df9415b6. 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/UAMM12100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c0657cacd41795fbae9950b5e74513da443d009be2666d94deaf86272166ae. 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/UAMM12100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9772167dca40eec72435d7e0604a3b66bd9cb6f93cf59b4d41caee83e5aa1eaa. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/UAMM12100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc417925d21027871a46ae428296ba2f16c715bdda5b97d4d5960fd04216cf31c. 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/UAMM12100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953f13af330353b149205639a735afb141777a91c1d8b4f082049425d6bc6bfc. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/UABM12200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8175505ea3fe036565ce66f75612c2145baa0ac213d938fbbfab03798df4ee. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/UABM12200168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545da59363b99745edef4e9e1302e30ccecf84514d5f11e1be9dfa9b5ffedae4. 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/UABM12200340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3352b2fd392b8804bf79ac6272d6dd6be7d75f8ef05a80fcd760474fe6c04d21. 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/TCAGJ2275239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ab774fb3a2a8b11e04ca711a59ea3c778b8ae7f7a71cdbd67e85de6d457395. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/UABM12200668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff035246809924c817b9559be03c6f5f86a2814a419e9f89ab146c0405f49f7. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/UABM12300142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41680392125214cf719941dd255426290635733cfb5ea0037f964f6944e2cb5. 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/UABM12300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b03cfc94b217b9c30ea52a1670c54063c9846f700a90ec7f67ec17227e59f6c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/UABM12300958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77c305c351aa84d24a30e56a47a5242c07a30d09246fb57f2c7cb0b59a43070. Chain 2 (Bitcoin): anchored in block 957830 (2026-07-13T09:15:55Z), 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/UABM12300961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e34fd74a309620a6595d92927c53b543b626b9ca07d9020d9c787898d62f57. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/UABM12400879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82acb381babc12d9dc102704ece3875ae52fccc6660a52c4c0b34fb93b2dc9e. 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/UABM12400882.