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 0xe7fca2ea711a5b4c0dce49b75c8446cf22a944dd7b380da2ee5aaacdfbdfa978. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3dba9a42-e845-463f-89e8-f21514dab5af.json and https://artists.proofprofile.net/proofs/artist/3dba9a42-e845-463f-89e8-f21514dab5af.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 0x2fb1c9f1ed7f452fbce44bedd759ec12677ac2dfb95a0d5f6a3523415a7b2a20. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USHM91898311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136c7c57178b6f305feb2f530752e4a3add8a1530759d30bb4bea9740fd18699. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES62529456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd87235aaf7649401d97cd950ba38c24e340a85ea84bb108d9a1b757f18b9847. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES62529458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6e018649265c2ccad4b8e80f6715b9da57802a6c4beaa6803eb9e643024cc4. 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/QZES62529459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532baa98394c4e7bcddded7f8bfdaa1b737c23b950450e40d3a8d0ec677f228e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNA2504666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10386b0146ef1d2d8fb5a0aea79d0c6b282e28fba2d599ce2318b94547191023. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHNA2504667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e68b864ec24331aef5388bb0d526bca36041640abab82b649db57007b2e9de5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNA2504668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302840792a6d2d218f1487994e0b550687489690a86869d6cd8997cfa0d285de. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNA2504669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793e3d2c13a97d39bbb15d65d17c692420da1048d801af810c0eb6f1d099f5df. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZHNA2504670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f5450545ad4b4632fa85e42d33fbc68d1ec203b56b02d52131dd4ef7cc40cf. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHNA2504671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9222e177fa17423bf208ee9d55a525d6930d85751abee3cf97ea7a25b6284e99. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZHNA2504672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b07d65a7fdb0f2f2a689b3bb36fa0233ffadb6502ed22694db4a6996bbaf9c. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZHNA2504673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9349696724ed9beb4e66ceb75f68ae8e0bf061c4a8405f5d1c0b5306fd0b1ad1. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZHNA2504674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7678afdc153526c87cc724e28d5545f608eb482a61c28f56831e06f1bc30b965. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZHNA2504675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fe53fc40e76ff7fc13c976d85f1f202836113fdde5beea695f9ad4b7b9a363. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZHNA2504676.