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 0x8e9dda0f0f34dcc7b7246b73320732464fd73ebbf920e13d7cf1abb7a849fa98. 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/a8a6bfdd-dda8-467d-88ee-32c957347d09.json and https://artists.proofprofile.net/proofs/artist/a8a6bfdd-dda8-467d-88ee-32c957347d09.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 0x1e989e8ab19a9d80e74411bc18315f9195dcc6faa9e3fbb1d96f269c93b5804a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USHM21120784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e0b3acd1ecb48f83f0f7828d57a9dcc289c711368d45493cb439b31b42c789. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USHM21120788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0999d64072dc8566cfd5f3521ee15dda8e11396eabde2293fbe3b2527a68bb1. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/USHM21120790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41ae397e0713c0d243761e07aa4f83a69f3dc8c94cac295d548e5786065bda3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM21120792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88fd30841c60da9abfc3d6f7b14b742c7f2eaa31cef8e6f6b91fc84cb118d49. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USHM21120793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3f5d741e560d00cddbe84df84b75ae969f6c6da8da80b9c8f63db0281d47be. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/USHM21120797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74056a5e27e419aadfcaa529f4efef5a9de265d3dac8f02e41cc4a30fc39a90. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USHM21357325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134c6625ecf8ed83bd444902af7b1c10ded201cb3edfc3320a3dd7c5da1bb719. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USHM21357329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb1e7dcc893d8b18379e1382d42c7d266bddeeb7232268c0a9bb90802945424. 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/USHM21357332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cbf5852e221e13dbbe8b05e07b0628d7c44c0aff7c1f7b8f2798c25e223482. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USHM21357339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23952dbf2d26de388bac32903f3930bd5af667bd8bceefa9d5438015828145ee. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZPLR2117871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e3ccfbd0d926e5f9f7bd08d082194246b426cf1119bcc6cfe9906e472ad5fa. 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/QZPLR2117870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d71acdcc921601d3a00c6bd8d508b758c16169f4f5491315c966f283491d83. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZPLR2120144.