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 0x367f0d15a77d4755d93e26ac25000152b5a82e0ff02784557d187ae0d6c44e8a. 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/1801e89c-eea3-433d-9ab5-fb31e67e3e91.json and https://artists.proofprofile.net/proofs/artist/1801e89c-eea3-433d-9ab5-fb31e67e3e91.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 0xf89ff411d71461db097a72e7e7b07e2969c15c2c2406b3055b27b7ddca8551ba. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QT3F42403838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67c392c834c9de65ce7476bd62ec085e73f0411092d7dfced85b42abe4bf7c4. 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/QT3F42403839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8f8457d2ad4d368d49f878fe2e34333148c0475f7fd23390e1884c39bc59bc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QT3F42403840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0b79d31ddd547166f26f6786422f5798c1de7f6a61f4ff2929afface81249b. 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/QT3F42403841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d243ad7b510866a6bce0aa4c8cad3a0cd3fa9a282d246cc176a1f63f1707b53. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QT3F42403842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb130c717b5f2a111d9ddbe001a0553043d9566a44bcb9a889f8ed57939499e. 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/QT3F42403843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72aab85601b45f8dd71c0084afdbfaafe3c1e7afcd36f6a7723aecc103ff60b. 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/QT3F42403844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29ae910cdcfc4e801132b548ad38cfe11b5483dfe2501d7237378f0c91a9be8. 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/QT3F42403845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe367f2781a81ef99c680b20c349dc2015473fb068313a788376009b199d97b7. 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/QT3F42452840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06b38b8a004bd28353a4bfb30f43cbedbaebacdc2ec668ccefee0cd8babcd08. 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/QT3F42452841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca2276f1dc575df23fdef579b2d26edd353bc87a22b938308f404f440403827. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:02:32Z), 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/QT3F42452842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d14289824358b085d74be109167133a05e9edc0a264fdb050c5ede54763d836. 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/QT3F42452843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cef3558c223b21949d607e5389d47e00292d51fe9920c534d71679fee5e7ebc. 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/QT3F42452844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117caf62ce5f0e87afdec37b70db952ce5b1bfaaec68da0cb6998fc31163e727. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QT3F42452845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440fa6dfa22c8b5134fd683359abd1d0170e814fa54b4e5de865b54a14213608. 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/QT3F42452846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1126d4849d89a4c4aabc1280227215eb55e50581c5a4014fa59c1ffea53112ea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QT3F42412191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e126b5dd18111f8a0857afe251551d471d018875f38606f6287912d6f2394ca. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:50:36Z), 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/QT3F42405462.