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 0xda5c4972dab180161f2098da42e94aeb75ec66b62329f59a39c4ee9784203d04. 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/836ab14b-2ffd-444b-b899-b8b7a8ed7b9b.json and https://artists.proofprofile.net/proofs/artist/836ab14b-2ffd-444b-b899-b8b7a8ed7b9b.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 0xd17774a2d569b3e500827276031c644be312ac45091d7a8bcaae23b975472b25. 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/USYAW1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd64a24005ffdccdc0e23d47ba925d78e689a8c2433c7b843e66c1d7b5d67c31. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USHR11536775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579dcfadb68904382589d38411568f27e76b005a62329156d6cc3fdd0d97185c. 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/USHR11536776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8863ddbedb933deff3876272b021b5712272037560cde4f666051ed788b63f8. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USHR11536777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeed7b1f263f10ca754e5bf944a3bce83666ff123a9c2b5aea74fee4c059c0e1. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USHR11536783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49273e90723c817d924a28e94c86c23117f6270d8ab76cc65f97b8bbf815ce83. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHR11637708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903e099496e702f0c6b9da7475ec878af21d569a48a44a2e14c17d1a32646a3d. 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/QM42K1835100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaac65b09776a158dec06e0e1b598f1b776fb3a70f9c7c5a384b1e68e2751650. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/GBKPL1951596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6f4e9a2cd670058f37b0054b43d1fbfa6f8dcacd6e49e070c5cef57f6e8bb6. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/GBKPL2086652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2563627ec47d9e2467b8816890f79308f0caa8762d13680c5b38b58e56990133. 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/QM4TW2388569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e62033d4bce95c786ee4ddfb383ca3d13991b8b131497ad54fa4b80b77ffbb1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QMDA72362637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb473d27b2ddbaa0cb7313d700fbe5f6fd0e716a63a1655012caa66233209477. 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/QM6N22342218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2563627ec47d9e2467b8816890f79308f0caa8762d13680c5b38b58e56990133. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QM4TW2388569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9e57f8c135a91fb80e4309756c4fd79a4dc70916862501a51def1112bf1ad3. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QMFME2314668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a25723fa7d8f4d77a794223c0768b1a03249beb1e9a1ab09fef0b45e29ce80. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QMBZ92359126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe647c187430c3fd8aad77ba32a5db78dda12ea519b7ff8e84bcb2ac4ded9134f. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QMFME2314723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c6743bce1d9888b9865781713cee78b8cd622b5abb84708b01c6a03f097738. 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/QMFME2314728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d293b6346361f17fe8d13b71a0dd810a763cd6ac012c3ef11c8ea00511c756. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QMDA72390716.