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 0x6a535e6ce2d65909649910c7bdb2e0751751279506eab03ac65230e65285417d. 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/bbb1e9a0-6de6-4f10-a377-9118ffd90e18.json and https://artists.proofprofile.net/proofs/artist/bbb1e9a0-6de6-4f10-a377-9118ffd90e18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
If Only I Could Turn Back the Time and Look at You Again
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 0x3f98daae7d46b6a5e68f147a8896274ecd426342d38709d0c3a43daa81a9bf3c. 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/QZTAT2315794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acb348657fc8af808599d42fdb01d64704bdbc5b9cb857c9ad6858a79073bc3. 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/QZTAX2310298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934034ed43bb63de53cef6d0caed2113ca78ac7358746587d4b2d2439985d05c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZTAX2329935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba6f57e931748c48a763ee9236e3e0dbcfcf2687d36d7a5a0c1945b6708c6fb. 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/QZTBA2395838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aaad703f74992bec511a128db095837db35c9c41e726cf5e9944c5ca608db10. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAHQ2392118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c988f995fa867f8051dfe191455dd4746ddba98e85442b14e504a12454ad77. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZPEW2427171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b7ec301a3f30be5980f7d5e3c2ce451bf7eb3ccc29bf30b7667d7d3f6dc011. 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/QZPLR2492709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21eed12ac4085e6b3db39950f6f36db26528df1389ef6f093071f8114e5aaa65. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZPLR2492710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9647a2db4debf5482c2049e31e578d225e2b639b9cdfd9137bddfeea398ebb. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZHN42564262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8124f47e4c1fce45f376d58792f229920fc3251e4b7e722e006f5a4b7b2c040. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZK6L2573478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a3e76c525f364199ff026c2eada0f79ac881e39a19c2523f644f098c5afd43. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTAS2549600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1fb666a33ec78aa13d54772f07192c075ea8050a279a47bd6df61a7b60754d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZVEM2529140.