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 0x5755586e4887c6364e3842e85fb8507db98daa59255e5b5d77fb07e16cbb43a8. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58f4e55f-6124-480d-927e-800195f30150.json and https://artists.proofprofile.net/proofs/artist/58f4e55f-6124-480d-927e-800195f30150.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 0xcde29430dd4d4ae90e0792b5cdf3c5acce5ce35bd6fc46b95d5242d80ff0cee1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZRP42486637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2714e5a05ba80d82cafc664a55a61e4d97c37aac320d936b85211c2b458ec5d8. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZTAT2419688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415886d399c3516524186e13ecc8823687da691e9337eb8737aedcba102099b0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAY2483500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571342cbcb7e333deb55402318aeb1990dbf4aafe9c5fc71705c82a4f48c8618. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTB52430594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86beb585dc2a4cffd82b1d995b19905f67fee11b1186f27fd8d237bdb4bb5f1. 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/QZTB52430595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770cfa8b619ed5d04d8c8a2cbcaeb9617f256f456bb442f1d101813d945629e2. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZTB52430596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788f7734b344000e3ea94c22c4f5700246059fc3eea90d8e93418c95d438f5e1. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZTB52430597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84afc692beac3c91201d4b9b5586002a5a15716ff7edb946840ad12d0157fe4. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZTB52430598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c25a4cb9b89dd79c3f52123b4295d380504ab0d8904fd68276e04f40dc59200. 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/QZTB52430599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f447b98d2fb633e84a0e83b067c7870f44a54e25842c5190e994e0a6dab437. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFF2404644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f55e55dd290bed256f9f86fa755ac1910d54ceb80ef3c5a90da52b1d614eb51. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFM2472421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb5e72d6f320bb91f3227cfe5bb0c0a66753a9b55c6d30f42a73f3b9ed17366. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ762495273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300acb7256ddfade9b789ed3fa150c0d6536956dee56c011f84093a28f4b46c7. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZZ782466606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7229a6cf82129d3b6954cb7fbfb498e9d7809ae01f7f8fa6c7a0d044461f048. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZZ7N2442923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1851fc4e64625367e1dea53a13dbd1227b399828a1f3c0aef2aab3b3cfac780e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ7V2448994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa551c1d768aa05107278be04c2c07291ec1360ebc9e27dae71090b5a4f1024e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ32582138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77cacff746c17a46495c73ade3bd70b98afbd5cada60cf1340926167a3154d7. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZFZ32582139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb5d9c7ec07c2c451e85b840ba84d26e94bcd34a77daed0241b5ecbf668544d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZFZ32582140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6c1bf568590311c59fa1fb90a17357cdef5b20e6b749dd2283fdfc16905d3a. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZFZ32582141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ac6787f58ad73e21e4dd105121073215450baef7926b047f54e31c305b758d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTB32571219.