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 0xcbd6d5675a1042344b78630f99202f14f4d5482206fcbdbc0f12dcd7b4eb7ab9. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1215bd15-c0aa-43b5-a864-ce74bf351bb5.json and https://artists.proofprofile.net/proofs/artist/1215bd15-c0aa-43b5-a864-ce74bf351bb5.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 0xf918d038dd7d3755bf1489621d4b246b5fe94d5da5a452b3df5963e5e130310b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:53:55Z), 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/QZMEN2269798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592b6a3e7871d2e6ac97e89fff2641ac339525ef20704ac7cfc0fafc6104623d. 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/QZMEN2264625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503b574e205180a77b8bb5541bcce03f9111789acc8a13560a007549eb1616c4. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZMEN2269801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fcb4ddb29a8834c549c8b951e439f48b7388c974d53a1557ce50ed1a07638b. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZMEN2269802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfd645d14363d05a32c074d51243e68962f93bc796f0465cfd41e308381d35f. 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/QZMEN2269804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3457231cecf813727d5499706d5e113090036dffe2c32e1e86571add346527a3. 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/QZMEN2269805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa54591877964bbd5e0c1365f0d1c9e187b85c866f199267e57f3534ebe1c4c. 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/QZK6F2569541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8b90df2024e8b867c02d9eb63cd0d63ac78788ed67334a9ac0fd83426185da. 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/QZK6F2569547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa54591877964bbd5e0c1365f0d1c9e187b85c866f199267e57f3534ebe1c4c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6F2569541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536f86b2da45827b0a3b48105ddd577db0c9855d1846fd23c9ecafefafc5507c. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6F2569540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa54591877964bbd5e0c1365f0d1c9e187b85c866f199267e57f3534ebe1c4c. 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/QZK6F2569541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bc7d566ec8e94d23f63621d01dd6b23e4d5fa5b35d62d626fa8d5d01f13fa6. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZK6F2569542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d9b682b92c74fc2fdc80a0cc8dda64dfa36cf4c769d8d15642320213c54ab7. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:36:29Z), 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/QZK6F2569543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6717db11da44662ba9adfda3ca71f127a40b857719fd105a682de718220364f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZK6F2569544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81e4378ce2971900a7ee03d5010a49d82b625b1a5ee30d108f9b19e29368cf7. 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/QZK6F2569546.