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 0x73d33568cef5a0a1c2053d57a13684dfb85a6953522cfcb1dee21c8569069a89. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42cac528-dfeb-4d13-9fd4-6503bd0e88bd.json and https://artists.proofprofile.net/proofs/artist/42cac528-dfeb-4d13-9fd4-6503bd0e88bd.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 0x3b48bc387fd16e25eb092448e27cc50970f8cf443aadc276eab39f4f44442e09. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USJ3V1093089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ae36ba810e19a6be67e94a1aaca13b15bbb43a0bb766954305fac0d1139643. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QMXDC1100264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815504f62fbe92fffaaa46ad0521a7ada146987c3e9754e16397dcb5d5ff4244. 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/QMXDC1100266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf345606d6cf42f566d6b47e4be03b104b80171945cf25bfe7e302ab1974c68f6. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QMXDC1100267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8057bb457c3e553c864da6110bb5800e9188f252deee94952411fc0ac690867. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QMXDC1100269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5b873a35e8102118d06d9bb3a1d1d80707f9988664ddf6ce634c0272c52089. 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/QMXDC1100340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0059d572b3322a97c00cd14ac68c3c961b613de17dd2a376cfe4bab2225c93a9. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QMXDC1100342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f65890a682269669284ee9febe43afd1a3296588ab071412a90dbbdc43ef365. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QMFME1350243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0122dd15cf5982c90ddb51769ab34d5ae78ad7600cf2fe1eed917abf6274adb2. 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/QMFME1350246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0164d25cedecf8d243477c0fcc857d6b0bf20d5ed109fcc705d301d29202e3a2. 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/QMFME1350247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921472e75c0fa609e7bfb89fb8c07b9cbaf33b6ffac5909fab5359fa1386e04d. 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/QMFME1350248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345cfb7804a2acf73884c347eb5e86b12a56a64e1995421520e713d7c3c936ca. 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/QMFME1350250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1f80dfb60a3c177f11579adf6b581d267ce531341c1bb13897ac98b6343485. 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/QMFME1350251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab478c1805d82eb44f788c42ddf7349fcb9362ff42e960bb79a4bbd52ad72f3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/MXF018801012.