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 0x11637e5631d168a84aafaf5e31fd69c8bcf634448f6ebd4405b240cb9e825e72. 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/176dab94-c60e-4b2c-93b4-002c2cddb4ed.json and https://artists.proofprofile.net/proofs/artist/176dab94-c60e-4b2c-93b4-002c2cddb4ed.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 0x4038c837ca5bf82280421011d9ab795ece089dc2632373cec899f83cf025e8b3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZARB1892553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61db385be4fca73aa61b012f5bdf43c6341eef292038d5a6113f8e1b358b29c8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZARB1892555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46d8ace064cd0bb2e55f0f6280b6e93e1234c1b8691d8c85e0caa2944e9e76a. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZARB1892432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe17f848a69b635c791910e69253c98fcc3a8d2c68f5afb6f5c2384dd8157e15. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/RUAEX2235684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418df7080daf311c90b7a51da8c50af1665babd4fef260a62d2cfd2a6bcde8aa. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR59R2392868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8facffa133dfa8623df3f9d975011e147f48812623687385175d598df08e734. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA0R2315435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5306e2e9667d6dd6ce2f4f42c1b2ed9c608959fad2eda4009062be01a72bf9d7. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FR96X2438951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4773dbdecd7ffb1806268128b79aab68b30edcd58b9ad1315ba8742ba3319346. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FRX202446615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30880a2eb1272aa19c475e6ed2ba395d96d5d5138d933ff7834f3a50d487cda. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA0P2403139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdfe53b783cf0cad2dfd5272c51c8b1a3da3a1ab50341e7a6bee2411f5da6e6. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DGA0P2403140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca38ac7c921e026af9ab55a4b84705ce2e29d5bd8fd946346ad657f5c7b1e4be. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/DGA0P2403141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7047457fb9bc8f8f68c641f6856113d17fc2037ba288198dc7af6bbe57a49e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/DGA0P2403142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9792467631c7da46a05a2e0880e2729ffffab03359cce1db38a325b1c7c9525f. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/FR2X42596249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc06dd00b8b33904ed504b55479caf0d39cf384b090562a66fb94b201c69ae74. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/FR2X42596250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df711d1ddbe623eeeb8f24803c318094952d708b538e93fc72605dd06698a1b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/FR2X42596251.