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 0xe16e172c333da47fd839c7df92ff852532b55cd76e932c1203c94c4545b1bf32. 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/f4fadf3a-0c61-49ce-b562-f70823e2c9bd.json and https://artists.proofprofile.net/proofs/artist/f4fadf3a-0c61-49ce-b562-f70823e2c9bd.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 0xbfdcfedc6cfdfa60771b2244d20fb693db4f9ccbc0297da36ff6e7a1d6c5a40f. 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/QZFYW1947681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0af856f81ea47add0e2959de74fd13aed7f5b7f7930f74e5b8527daceb70da8. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZFZ61921866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d003167929e4769e36e86c9e3dafbe846c96cc7f14e59ee0d38355f2438e47a. 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/QZHN31951839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf58f41b1fbe5a879ea55c3e8b214e870976f9abfb4e3ad5f81aadc8a6d40648. 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/QZHN31951840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5808304e3617870a93f431d2e65581f2fd662520ab6d140d143a722ca3257302. 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/QZHN31951842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8a28b54c8e25d504911ebb9445748848d25f10da6d947976b5e7c486e6d24d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHN31951844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609a25a437237d692614baebb1f00789c64379cf7965e4173b81f384cb1bc80e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHN31951846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782d4b0c4f08c89851a5f52266ad90fca76ac5502272afacf6e54b80e4dd03bb. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZK6L2164147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676eb7b70cf70f396eefd64ad23c005d62e233073001bb5335e0400849d51a5b. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZK6L2164148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec63642460e8d1ac460625fac505c1007f2f6d4b40f5045d0e84017e935aad1. 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/QZK6L2164150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ec9a34ed5f91cb0fc8fdb8b9970106cf8c7050887eedfbd5f58d0ed538f51e. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZK6L2164154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66eac90d093c122192f695d9ed61c3c062f0fa017c59ad105f8d98120d339dd8. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZK6L2164157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1895e0c0b365f0c047058ed46aa9d95a646559ddfee97246f1302e85a81ffd. 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/QZNWR2502042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee36d65284f5d51c7ec9b1969dc851c26ce178e70d72b9653b0a8ef57c98c343. 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/QZTB62503884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d3046e90fdd018abdcbf5109e97b1313bcada6f4acb50a58f1675773e0f442. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNMT2187022.