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 0xd068b7876396d3d789051a68223d6e546cbd5a53eb585368ec4bde65d1624aa2. 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/7a56964a-a050-4a4b-958a-07e87be206bf.json and https://artists.proofprofile.net/proofs/artist/7a56964a-a050-4a4b-958a-07e87be206bf.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 0xc25b4f0c06337af78d014fd236d5723a9e828fd064353f4cdda3f3acf07190e8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZHN32090113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80cdafc54f5143886098fdf6edca727a46cca8ddcc367d10689e8eac248552b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHN72045461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa618027386edb9b6786d2bad54b005c19e9165880a62b712e7facdb963a8dc86. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZHNC2144341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7c27207a7ee7aeed3555a19256b0e0843fe89748e5b2e8dc2d74816844cef1. 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/QZK6Q2179652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfae91244c65df2c2b42e028ca25125f8c4faff7e55658dbd76f9ba728f1391b. 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/QZK6Q2179653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed4d97fb8b4a22447ff665cd8cdcbaddab51cabda1da7acde3c9edfeed6e0c1. 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/QZK6K2163723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb09bddf621be175097ed61fdd1917117d385882eab32c333c8bca846459c95b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAS2194564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5221ff5530689e1aea4f7231450f14a69baa8952fd1edb37b49ab2bc86e89b8b. 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/QZK6F2206701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9853b9ccddf146da9de0cde47a8430accc98265d77c7455c78c92beaf9fb7491. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZNWR2266032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f2ba83fbc2f34038dc8145736aa7b286c3072c441368a1c6a59876c1a05ba1. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZTAS2290192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a5eeb039a34ec3b4ec734310b337ed86ec5ebc2b878bc43a0908a7bbf34e9a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZTAX2211094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142c8cc1fe5463d3d756b38cec1d55e3c5c5cccd3ccaf961c604d9fb3e8bac99. 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/QZTB92289745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f2ba83fbc2f34038dc8145736aa7b286c3072c441368a1c6a59876c1a05ba1. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZTAS2290192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6fbdb4bf871d6ec8c5bf143a4fe52fc12eb8951b89facee5dbb7f9515def99. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZTB92289746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf895bf11e2c7abc4b1e5e6d43a9a45ffa2f4e8271760623df5bf638c439f1c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTB92289752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacde6c9c9107cf844e5079656978c9d6ddd3842e3b44df044c238482d76f2cd2. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZK6F2355772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fdc9700b919aaf8cfc5182e5b131ada1c9a5e427a3aa0eef2db9bf1cf84788. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZNWV2351591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864124b88c2c63c767c831970da8933465ca87a43d20124e32bf2975accc3317. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKXN22325583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4617612f2e0c5e14d9f88121a9c8cec468aecbf6f712d74d2b0301fe5f0f8924. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTBA2479870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f0ab9b53e3361f45c1ce8c1e85e9266a5e818a1929131ca81ad80e877236a4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTAX2570784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde35eabd55c5f2f613ea385f142211b1ebeb46b581e3d34b733e96675c670f2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3F42502215.