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 0xfd859df9451a3c279fb8771b06f261fd6aa3e93a3c55b17c00fdb9bb0197cc4d. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e5b475d1-6b33-43fa-ad4c-5c48445e6a36.json and https://artists.proofprofile.net/proofs/artist/e5b475d1-6b33-43fa-ad4c-5c48445e6a36.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 0xb2abb15d953c0c4fce6beff7daca9ca62dd5175ff92a4199419583c2219607be. 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/QZHNB2412045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db8f2386f080b731076c7031dfd8027c30e101cdec31de4fa29767a3e7ad721. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZHNB2412046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54f89d61f66d1cff054cbecb2cdc253702e9d88a268090c75547034b9a9a3cf. 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/QZNWZ2490354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08513212dd350590d735b52ef95cbd8a7a8f7c78790ad55c4b65cb8c697049e. 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/QZNWZ2490355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631b5b4610069784e752542573c81cd69e6465129bbd970902cdad8b7b6b821e. 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/QZNWZ2490356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1192a1d8875f751e0a1f8d231e32a7c6639181381e67038bf7695367db921cbf. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZNWZ2490357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4424647b0bc2571cafb25cf9b0b11e4afb603ef5705350395be446e80fc335a. 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/QZNWZ2490358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3421c0bd2635d5e8798c0d16d1e24e18d1a42eb7e24de39237f269c56d3b6509. 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/QZK6P2438176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd220ecaa0eaccd7b2e67a7436e57c5e958d9a532b4a4d5f66d8402bc29eff9ff. 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/QZHNC2472907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3d74becef2442fcf15b6d1c29027e2345fbb84431ce2399506304184affb87. 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/QZHNC2472908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b44e618c85d4d8368ff990ed4e9d482b365774c6a6ed9ff52e12c9985b3adce. 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/QZHNC2472909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b8cd4ccfab53264072d2a2c838723ac7d03bd113dbd0b9f2fdf3bf0265b23d. 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/QZK6Q2437551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13902ee46786c706fa821c0115092cc89996611ae1f7738cbc74800b7b2ac25. 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/QZHNC2472911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa40321152bb8dff6f24d080b3b5554b28f5b51c6f8031f0a3e4c485f62a3291. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZHN42413909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92cb73ce12ff27484858fdf281cde0844f953184e4a31de7cb3190c770b4a5a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTBD2366562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0640cda060ebe1022ee3f584590c9cd0b28ba7b38b5f28d59bd44fecbc6fd1b8. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZTBD2366414.