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 0x223e23a41f7f31a31ef7fc9febb65e1226935f1043d24c9d077833c739280cfa. 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/62f3ef9d-865d-48c5-8a5a-fb76dfccafeb.json and https://artists.proofprofile.net/proofs/artist/62f3ef9d-865d-48c5-8a5a-fb76dfccafeb.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 0x79a1d818fa2621dcf1beea44d751db85e008c921acd114e820965efab27d6570. 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/JPU451710012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca6255536e9e390cf12d331e462f3b15f0c6d1570353d31821fc006d7cf2a30. 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/JPU451710013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03084b5a0cfad49c29c2a45e94d9fb0c3c81cdbd229ec1f09e8ef03b02c25be. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/JPU452010048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1fcd1f23405ad0c004ae44a3999fbcd94c7f5a1d4e4ce6f4f73bc6dfbd6c7f. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/JPU452010053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e22fb772462d94e9b88ba15d42894b78b679067251931065d17d0caf69a9803. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/JPU452110021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe775dc939ea65b773abb1c1f7c61fa7ff1ebbe0b04575b073da5b3e069a2b08c. 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/JPU452110032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3f1c79f9dd117009af9952cf5f3557c42077edd516b669200b30b7321ceb90. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/JPU452110062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01eaeee1680a57d2b0c34605b2adf4bb1a27e3454651110e66b0dd8f786e3f0b. 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/JPU452210054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80418286b9f7a69436b016c06e1a54c15396275ad12dba846f2c10fa4005789. 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/JPU452210047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b65c6b633d9bc53efa472e37f43d06ddc9beccb12f9a3eaa4baf892737bd9bd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/JPU452210067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7116ad784ce8c6c648f56f3bbc15f29650de4946eabe9f1d85553a68fceb8025. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/JPU452310019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0acc1e385da07503a695c22a2af156b998f134e05e4189322181d5dc78e42af. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/JPU452310071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb72e4aaa9accb373c7c3924e571233dd64f44f302c3f084a336977657fb8544. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCJPA2447146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d83cc1c6e1a5c7bc3530a88878700b0040ba75b29e299721ae967d68bd4653b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCJPA2447169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c12c1b4107dccc290e8a6f070d449a1d333514cb51edef11ff6a7bc2acda142. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCJPA2447175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cebf517593f1cc89a75701edf6ef928e89f142b4df996bb95b791dc489b483. 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/TCJPC2404140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394e7aed14ce1176693de5b1e9a957c5630f0596bf2e33a2f3e7c416f1df89b3. 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/TCJPJ2569016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe054da8182422beb3e2d97585a5dc16d735b13c1e0ab5c76f1f3e3d5ea122e8c. 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/TCJPJ2569122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17d389f01560167c268d38ce52ce39f5cace5227a4a0b66238dc98256241186. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/JPVI01521180.