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 0x1aa0ef83ebcfb4b8e498171a4bee8d19e7ea4ed12ea9c6f93104635662a9b00b. 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/f92085e9-c20a-4c90-bb87-c3d0cd1249a4.json and https://artists.proofprofile.net/proofs/artist/f92085e9-c20a-4c90-bb87-c3d0cd1249a4.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 0xaed6f77b7c931876c02687cbd8ba7c5c245b4b8303f51b727985e27838af4ee9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US66W1800211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa660edbb11cf87393cc9cb018fa718351d0eebe5b329c3d33e73fdab04a8e271. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T17:34:47Z), 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/FR10S1950879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628914f863ec4a3f04d383d8419db079e8f2debe472e9b66b4657454ece54cda. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:10:11Z), 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/US66W1900421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc652eb7ef18108fe6eac922974c98c4e513a4d7e157ea0b686867244afa6219f. 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/US66W2100661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7859acbd769ddd3fabf5224ac4a1c6aa74b338471908eef3f54cd9a2fb2dd971. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBLFP2262444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21110b3266c21714ff9e00124032ca2d152d05ee7a986c40721d9bbd6bb2854. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:27:10Z), 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/FRX282009066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d550800f483079ca486154c98d87d6d0b9fb29b917c30159a038f352884f3c2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GX3Q92200142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9989f3ce924e9eb09e7490756d087209f719b5831fc876ea9c13ae3ba7ce743. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/DEY472479783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4f9833a16da893695cf0db6dad6d27249f116bf49d45aa577870ca4f749065. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKXN22596477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a20595323f636e4b131cb3e1277815c3a406b0de2d162ddba16fe5e65caee9. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:19:53Z), 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/GX53U2540331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc940c484de165c5c449a4034df3c98bbb6e50066aa6e0d3d58c8ed03e3e45f1. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:08:44Z), 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/GX53U2527948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295247e53653569b69a90efdf03553557186fd028641a69077bf69173179cf6d. 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/GXHG92563654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf275b463036e899e0b6925081054c5f414d69bc389482a3a998b48cf4724b0e. 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/USUYG1138572.