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 0xf1e3396092a336929a4e02e3246348ee17f80998c77c85f6b7172e97fc357c52. 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/6122b149-9675-4ea0-aac9-c994cd66e20c.json and https://artists.proofprofile.net/proofs/artist/6122b149-9675-4ea0-aac9-c994cd66e20c.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 0x0eb432fa3a7577537bada9d0095fa77904a48e53a2dc44517ef4372d82026f58. 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/QZKDK2166831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93947bc952c6cd617e8f19acbd7d56d2499548739ac7501038e136ed9a376d4. 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/QZKDK2179380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec7917124ff608a2b0e89634e8a0466555fcdb2b157e428fd68d9ccc91ff7d2. 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/QZS652389354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f4dfd726ac3fb0d0803366ce2222ffd1e1d91f7839bb8586b3b3b45a014a0d. 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/QZS632277498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a71d0c47785c34055be4be5fe0daef7c93b267bfc397735c66fcad9b1c0055c. 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/QM42K2265731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a826aacf64243dbd762499f81e9ee17db4d86fd44ebb3bc04d0ebd33793f277. 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/QM42K2206361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7658eafeedcb489044ff240e4cbbb016dc374780eb218b94c1b6c61dd8d3f6e. 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/QZKDK2213707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdc644c03b50c0ba7f9e81c6259e606651ade9f3cc72d06b653990d51297916. 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/QZS672136248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058e73526ecc1167c07ddeb66cadc8adbec2fcb96df8201b7ec94db4ec01d5b3. 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/QZS642101868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccbb0ce3723ba71ac2d943572b61c6a6abd7e1a9df95b449d409f26537d24be. 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/QZS642127696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ecbf1395cb2bc9fbf50a136cfe67aad32f3dcbba9a824b68d27c81e58cec3b. 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/QZMHN2000718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b129fc9e988addfac6acf9bd32e726162ec523fb4065636fefea24c5884ba0. 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/QM42K2132482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36397701cc9b7c47716a97e5d11d8a2ad861eba2b3ce0bc8325f193264911e21. 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/QZDA62393629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d6b65a7a143b526f5d3d490b0d33390c98f71ac977082a8f45dffcfe048360. 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/QZDA62393630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57adb825d23bece8d1152ba7314e87cbc5a501efacd8e245b29886163c0319ea. 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/QZDA62393634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95f7ef1beff7993bf1fa07753914cf310bfe594957eeb6e3a82e1cad1f00048. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:26:53Z), 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/QZDA62393635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c59434f8b684ea8f1d1cebf3bea0f3b746b905b2030866282bc9dce364b2cc6. 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/QZDA62393641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7effc317195434b25690f1e303d6be717daadfea8b6a6cbc06dea3ed9f8abe. 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/QZNWY2342093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8de27c6da3845b512fbee076df3dbded9cdee06e11b1b78f5d1b34faad4a07. 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/QZES82132408.