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 0xad0f08620705ffa79f8dbb3aade5e2395176b85f234b2645b63caf6cad407ac0. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/308bcaa2-c491-4535-bf5d-c3d38b6cc6f9.json and https://artists.proofprofile.net/proofs/artist/308bcaa2-c491-4535-bf5d-c3d38b6cc6f9.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 0xcf8c7298f7f94fdea17fdfc2b74934b449f33d2544092f5c49add3906954abeb. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZW9L2364704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7484775ed274440ea84d69f1f25ec353005214f3c4d31907f184ed19da3f2b0f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB52236511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52079306f17068c08b37e0b8319d0bfe03d2182863fddcb85f867d40d2b7af40. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZTB52236512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96608f76d8c1dac97ff07020e471ddf9f799831484e1a3868de85f9ebbea611. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52236513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea00d44249e2cc96ab16899e3bccb2b02eccc5d5cd343831bdb950a12d03f3b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52236514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61146e48a87bc0b4095acb55ad32faf3fdec60dfba44ad1164302ff62f13045. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZTB52236515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66832136e5b779b4f79ba3e93ef1aad3ca65ad4c73179011bcd7af350cdc9ef5. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZTB52236517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8deb248340f02824d5f79b3773a48352b055e9792d53ee8a04cbc423b83dc3c3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52236518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e7b0e4d576be83227b0021b92815c177b9a6c96ef3ae78825f8b2137fd63f7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTB52236519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d1bed0c496b7e5ce0b4a6e77231a7a7c89a238b7679aaa7c5be70549d863c6. 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/QZTB52236520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a5074d082938dd4d62809fbcf0038c87dff18679883b39c6c2cec48aa97eaa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52236521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf812f17fad45183a51725fd8e4cae366006086e6f8f35171b320e6958e5c3922. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB52236522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a28ae785ec5c956cf230a70c55d7c175238634abc8dd1dc1735a3656c34b704. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZTB52236523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40667eece9c885f571e3c14aa75386fab411eeebafef4944cd0475f8db44b4e0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHZ42269580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200525a5a71d643076f9f2903a97f662ffc0f0a510b47be1a4211b1a6b208f18. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE5752456884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9646dfab2989a394a264646586126159f6dde2148ec06b64f997b818b6da92. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9L2275699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650c269b48beda58ecadf556ce919ebab6a84d9db614402f2f87be8abb8402df. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ5AB2358097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172f5971dd9a22bdf602d9ce870eb5857fbfc6bafe927f413e62916c4e3360fd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE5752416170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1592de036d52b529dbec640285cf3d5e04f15254e5d71a1639b0878bf70d6602. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SE6HN2425896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa83a51cae2b2d4bf1cf0c0869f0c5aa0e478815dc33f7293f6c3438e6c0cf3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6HN2425897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc7a8d157cd6addf23eebbe7d44df61eb2930ec658c2ea742f999667372c14e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SE6HN2425898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a65a9604f9c3c36f37d560d479a99b8afc1426e187b5ea46c1c7b5f6aee1a18. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAU2293758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f32ffbcd41377b63fb5bd69cc2d994ae5c0ee03dfa8a7aa5fabd7dcec1da39. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNJZ2403455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce609da396f397448b46e2f752a93c50e09f7172250334a0de2eb47c1d9d170d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNJZ2476881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ca225ba08c20c36d1793415c2c62ae533269dc84ecbafd0e085162fcd03bdd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZNJZ2476885.