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 0xc540279e70ea100dfd6ffe596656f0d6600ad3be51768979ec4caf7bf689eba0. 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/3c4502c9-9e55-4cc4-ba96-2bb93f21f913.json and https://artists.proofprofile.net/proofs/artist/3c4502c9-9e55-4cc4-ba96-2bb93f21f913.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 0x112b7d0e2a714d9faec8edb238061ee519b33ba36863670386f71da4bd8bb3e4. 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/SE6I32276417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66291fecc1b97b737adf90ffe96cca3bb338ddd8bd75a49332d11b2a092b8fc. 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/QZTLA2450722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462d229a94855a7f3c5593e348d4e6ab4d3fa3052242c16f6bf339427c511893. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6G2308160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2d21fca1667c49814444a2d621d404e321badb50add13474c8116f69dfe9b4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZS7J2224371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120a5ec57bac6e448119a1d438838095eb12742247ed8132d8179678dcb05937. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTL92308500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933a893a8a1ee10470d79f997ebb84580efbb23b1d48546861ff4182b2c8f85b. 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/QZS7J2383123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063c45d10111807661b7c1b98770be6af498b4a1e58144ae71bb72faa1d2022b. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZTB62258523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32bc12420fa5873f8617babde25eea1a5158af3d9a799ed29019e73e753dbff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB62258524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6cf03aa7d3da6168755369908e8be5f8aaf71c1fdd1855c1e82361015da1fd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB62258525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf01e6b735ff909fe9f9b96808eae21e82a7495521bc789e7400f4c2ed06849. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTB62258526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9eb309869092c4b766f0debaa13ec9e7f2cfaabdbe89567c41edb22dd0ca0c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB62258527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4869079432beb78e043b0cffc41c03c383b851760fbbb740fe83d92fbd830b0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZTB62258528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424f80b33385101161403540d4f429ca43b27b4c473921a439f6c8ae3e42d118. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB62258529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d3dd4fad83ce527fdd468d1063e2dd2235929a694ca440f16dc08a5a27dad7. 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/QZTB62258530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9dd03c9df91267696c0278e0a90d91737b545fc7ab444e80e2c8a7540ded6a8. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZTB62258531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2a17487214bc0ecf2745e1e08afd6145d4621a10903c081c30e3b07fde3c59. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB62258532.