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 0xad365f98cb7b5d0b1c95a0e9f346102dca939f76591dec2c7e5967d18c2ac478. 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/3f170a9d-621b-4769-b48e-550cf69c9a0d.json and https://artists.proofprofile.net/proofs/artist/3f170a9d-621b-4769-b48e-550cf69c9a0d.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 0x64dbb61d8f59c6d8700796f7ab8cdcc965de4edf8a8cffa5eb3cdeb0136fc90a. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZHNB2332169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4399c1a99c3ebd9a368d60f49ce43b596d3b34e1d83384190c698ae013aa14. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZHNB2332168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a4ec4d93d3a455e748f407b5a6f990f0c6b40623a64169bef9b7489c2ae32f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHNB2332171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c73515d3e631e44448a7cf032adc8414b192e1dc2a74c2d82ea81080c2b78c0. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZK6M2206342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe764e7350c7ee6aa78123f890d357a2b807629b6ec1883f3c16d03d7dd773310. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTB32234135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cafb91fbfa0ebeeaa5dc60cbf771478624a4624946b03901e1663339426c452. 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/QZHNB2332170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13661cc1e8e36fd1005356002ce2a7da5ceba03a05830f2ad9e6c29d6976d68. 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/QZHNB2332167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7127b72903f9bca9c1752473e372800708a9c88aa760073aa7b73541f57de680. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZDA52304563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927bcfd0defd7d11eb0ba263be99c8ba37476c6ad20b3ac3b2379310dee43334. 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/QZHN92363073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293d8c8cec88e10d13aa237fccf2f7589b4defd04ef32d0f24ee4bbc3475facd. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZHNB2331503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a6586961fea8018209da49459f9a42a8b36d11b873421617e6918c2a16b700. 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/QZK6Q2303621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d06ae1337d8cc2a2102bd40209097744d27322162436b50f2c7877cd0892d2. 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/SE5752414116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfbadce1509c0b5bac10907ff7cdb17fd967b13399a4ce2882ffd4fdb7ce777. 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/SE6QE2429327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccec70b8d1cdefd5c6dbdb2ff11e3afdda1a5516a91cf11df572a2c96ce5d9c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLC062239413.