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 0xdd33158003875325a221b89b22d16328331ddb701fa0b0ee470c606779940d33. 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/bff870a7-806e-4cda-8caf-7b9ce619be68.json and https://artists.proofprofile.net/proofs/artist/bff870a7-806e-4cda-8caf-7b9ce619be68.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 0x13aaa4c12ac9b24b5092c67a0a878a61cf10ef2c8fb08f462eec55a8827fa7a6. 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/TCAFQ2127744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6b8f15bfab9a8d63cd4fbf00635f2651ab2f440ca87e762b20926473affe64. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/TCAFQ2128046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30f42a1d14fb3dcfe259a1e126e5bc969f795fc9e32d2a606561fb498ce8d4a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAFQ2128056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66d7c5d51ee8159f3b6b0d84ac708c5aa3ebbae39e76a50418241a915c4a3e2. 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/TCAFQ2128064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9cdba5a24f7532ac652b071de7ac0ceda9804b3cc8770fa898f5dce616ddef. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/TCAFQ2128087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b4c3d9a98659e8e8efbc534100cead11ad88aab04f0287b2225f3571d43010. 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/TCAFQ2128103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835856cb26cbcd0204bee49725e846a55fd7fca7df42aad57ee9a7e1254477cb. 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/QZTAT2475717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960b1630bfce97f30752bbdef29d0071d19ec9099afecbbf51205bb1cd75f7c0. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMWYT2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444fa9a574db27ed6d5f08f11974c4f0769328a80122f5f420e2fd22a5fead98. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QMWYT2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393958ca6f9e9fd75812828aa784450b063eec1ca63e65940a8e8bb857ad9eb2. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCAIR2413410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960b1630bfce97f30752bbdef29d0071d19ec9099afecbbf51205bb1cd75f7c0. 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/QMWYT2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a10cae0011c1d0a85e318060b378e727babdd4e6a93bd755f2d4d40718a4f32. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMWYT2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343de0c2f396eebcde8633120f5786b84add54b0418b359f0dc38541d07994bc. 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/QMWYT2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1c858dfdae6c267438f83d8f6732b85c31639a558c3d7d340bf1240fb9d6fd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMWYT2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe8e3cc1be81fc291c9eb979e1e3c53178f52a954afd8df75de73adf8929006. 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/QMWYT2400021.