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 0xd8a8e8ce766008c6879abd70471870ece55ebd91d6b8cf6525b6dc824e4bc06c. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ab29d2e-c236-44b7-a312-0c66013af0ac.json and https://artists.proofprofile.net/proofs/artist/4ab29d2e-c236-44b7-a312-0c66013af0ac.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 0x9fb49f6869570559566a1b3abf62b9ee9f6b6e9ee25fb192cbd1120bc9e60a98. 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/QZWFE2348174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28133d44028fc3b5d6a102fcd88de32b5abf2411bc360c0311204120ba44f555. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/SE6XX2382626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595180a690dd2658f546906ccc44efc68fd67aa706832ebc86d5e2b797d8565b. 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/SE62M2376415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663206a9f9da107503d2f25f8643dbf456fef4b3670d4f432868db65495a2be5. 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/QZTAU2386244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acc03d5a4826fda7cd5d576798240eac5cf8e4d7e15f4200e59a401bcfd82a8. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/US7VG2489352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f0a34b1fde234550466fb0bfabc8c8496878f52a8b7e87c8c466e73b320cbb. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZ5AB2429826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f270b034d1dc27a989d92fb4ef3d5096418c879c2bc303413479a7a62d7863. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/SE6A92392069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548b46488e7b7f293a598de3b0d181415af3c4c207128b6c3bf72b6f53d6fbd8. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/UKXN22445658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ef9618e50c52ee06ce26070c0077583f0fa4f6d4d8789195b7eef7042216d0. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GBMA22496870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9559941aa9abda60c86506040f00ec18ef5eb7450c5fa1eb126341a6fe842da. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/GBMA22497907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc392b4e21614bd85dc91a40290425bc048131af5e08d1703379c47e0949d01d3. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/GBMA22496483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c59826dd8f3e35b1b4efd6e465d271205803bbb568f8dcce301dd591bbc7fe9. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/UKXN22560632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b94b19e02c939aba37b7a01ef0523d954230738dd8edb9f88fa83e8f4357d6. 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/UKXN22560630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1ed8b57401af1d144a27d33dd38b53122ea612afdc3cbe31baf2c2c6f3f1d8. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/UKXN22560631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64814ecacb148405f68abbc2bc64470edba4740dbec5a4b10d3a47ef417d5326. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/UKXN22550663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ec7d476c705abbbf7c0d2e426d01724933bfb5f2e35fc150788b794d81eb75. 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/UKXN22550662.