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 0x8725a65caa77c5889185a22268cd61ee7db59833359f4b8e283687a64be7b7e2. 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/d9fc2b67-5783-4bf1-a9bc-85f9982624b3.json and https://artists.proofprofile.net/proofs/artist/d9fc2b67-5783-4bf1-a9bc-85f9982624b3.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 0x68ac9a1eaebd5a1854c458dbc13e1e1c1e4b8c4f08206b7777643f42d4f59565. 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/TCAHO2302560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326006e0e560a778e1fc1e4834b0fa848abbe76bf0777ad870ac6fe84758c426. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CAGOO2335828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728426231c0e5e2001e2d7154e64db2d27898cb86686fd6e5d7ae1e91e71eeb1. 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/QZMZ92339848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19243b5e623a6c59864183ab796a18154ec3d2d0b7bdae6d8df33262f73c067. 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/CAGOO2323847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a33c40d9c5bd33beae91ec5d4dd71915af4ce98b233412eeecd4f19fd0843b2. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZWFQ2352813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd91861b8cde3958886e5ee3bf14091011799ce0e315d38740c61741f01ceed4. Chain 2 (Bitcoin): anchored in block 957702 (2026-07-12T12:25:41Z), 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/CAHQJ2464294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a76207c1d571c7cbd3ccbe7460765b4c0e70e83171160f275b655597e364c97. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CACWV2450994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e55fcb8b4b8f52c890de435ed9a213a0c1a4ccbf6a07aa53a3e84b49366c66. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CAENV2462762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb866417f26eaad25063f054e2c0548c1619c054b340d66caad5bc10bbe54764f. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/CAGOO2439821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec13ad1c3987ca1f33714dbc0f5c66274855bde3039d37682450bced290f8835. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/CAGOO2478331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce41b1590c28764c960b8b530bccc6169d040193665846a4f5b2ad05bd82993. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/CAGOO2494475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbc8fcc2caa52d20f1f66a485fa7c7f5e4123f9c3aed00dbda2e7addc99669f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/CALVP2442510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4075ab226fb06f472e8d7718a9910ba69ed0bba0e4e04030abfe18081bd97fc. 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/CALVP2454986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14643202a36ada3aba1e7a1a5343092be56a7499a0cae19e415ff2a26180ce5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CBEYJ2420981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf127c183270fd0ffb27d03a21b362080154767630f642e268d9bef482037ad. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZGLS2528067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9876af1c2fba4196bd059b52d44971202817030cb382f526f789fc8a3189dba1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/CAENV2536082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ad8c87225bba86a9f71f481608732a8dd61d9afa8822e58571df7af4cfe471. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/CAENV2550260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435ebed77d1c2df8ac261f49b448b66e45f46b19da4099d93ddebb83fff13833. 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/CAGOO2577125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a5443f3dda38648687f7d1fa9f0a5131bd65edb77ec55d009892420d5a5257. 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/QZZ7S2563327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ae30137b6f22092d97deda28e36fa90a0c90d3838a00c14436ecda998cd251. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/CBEYJ2563389.