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 0x0175403a3a26987b3602027d7f869c62601a14cf5e1949e4e08840f1ddbfcd3b. 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/aad18641-35b4-49e7-8ce1-794e6cbf551d.json and https://artists.proofprofile.net/proofs/artist/aad18641-35b4-49e7-8ce1-794e6cbf551d.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 0xc156b55dc0a2c812d2855270d4840fa556a442412dcfa71f3e4b43eaa927218f. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZHZ32224963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9750e9f01b9f33feba11965923b6d12f2f434916663f6d3815bfdf41f844f7e6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNJW2235028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4350f18a07c9eec302d4c698606d4c0c0f760121c1a53131b129da7bbbfcd3b. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QM7282371301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5572de3395ed6b4fa10a89122bbdbb65d2396073aefb30768e5966f76e06d55. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNJY2310570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd360f9685cb9287503aa60411640d24246c20b0c7df24f865389023370de8b08. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZW9K2333536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe078ca5a739ce83d509cbbbe0f4b9ba86e3af1fdce8df7e4a3f2b12acb9e525a. 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/QZTVM2495220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d5ddda3e83b7e7052b0fee28bc8ccb6bdeba5ab4a5bf32dbeca13ac07f0f28. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZW9M2460581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ee7afd1d9519e2915919058e43b3d360063c3bc045c8857ecbb16337624cf4. 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/QZW9M2460582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cefc868c821515416a84bd027f5d7a836a784b3120c666ceec24416bb2830e8. 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/QZW9M2460583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4d22bcbbe6f7e597fbb1dd83069f7de9343396961547e70750572875d0b77a. 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/QZW9M2460584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5ff22b4ebff20ffd1fcc33a1476cbb8a4757c370d076add654b5ad4b7b9098. 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/QZW9M2460585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71b7ded5060620aafd7e951f27e91f09cb5fa954bb0ab0302c85c6fae9623ac. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/QZW9M2460587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e517fb7ab97381a01015b73949f722ecbf212c378432a66269dcced00c5569. 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/US7VG2579938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bac81b1f509c3444e4e5bb748b06820fc14ee584a4b92cf3150cae8d312524. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJX2586093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75bacb5f9b875d713521adb0f7bd3a8ee94be7672d36be2d5dd3f290b6e56dc7. 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/QZWV32387082.