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 0xe523f2a3df263270c5bd3821cd7be098fd98272c209d7ff5de12151d77fae063. 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/fc46c159-dc7f-4bdc-9d1c-2e508ba80696.json and https://artists.proofprofile.net/proofs/artist/fc46c159-dc7f-4bdc-9d1c-2e508ba80696.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 0xfed89630509a5836befca5478ba7ece3800f968325e2677288f7241900109c17. 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/CA5KR2450339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ddf613d20c668535d26053a968b2f0ec07337f601f356e7776094e8a6311c93. 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/CA5KR2450340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8eec053caac775dd38a460f77b1902cf3ac375a54da79e0522a289c9276c93. 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/CA5KR2450341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffdc156f3ad4ff3798faff277214fd0655c1f3b2fe5cc86757fb17a28024953. 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/NL8RL2325958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a9523c23cd99394c2d0e4a4b3fb0be1635e156611cc3e2ac8d3c0a8e286d46. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2348235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51ff3898edb6ef21bcc474f733b1ef7a2e0bb56fed29fea019516a85ed9b052. 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/CA5KR2348236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77b05386320f2696e52acc9fa262a8167f85508b20e659fb94d828481c3bfaa. 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/CA5KR2348237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb174b585edc6f58e5cfae1cd38871759cd87ff4bbb13ac33e98c29ce61a216ec. 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/CA5KR2348238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db01fae6f58e677baf56e6fcbcc2f0faaf3ae5f8f08125cfd0b5cd415f5d532. 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/QZMHM2382469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9e1b485897b0cccaa5b74227e25a9bb69b6b8da0a08358a4b375be8546e92d. 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/QZMHN2286479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a41f79c310a6be5a01201a1f332cc2e457c4c016b7cb33cc1231243949fe21. 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/QZMEM2144225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e234303139c40f30a575b946d0a6a56420833024c2f6c37eef07f2cc6378fe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2107621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732e46ab7fd2f369b51118a6fe779b0c0bc09c7d8fd3b41dba5b3904051ac3d2. 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/CA5KR2086419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe029f5c11d463bcabea22a580a8935d915fa89b2f80c6faaa1f695343ff22e. 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/CA5KR2086421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab36d362bc21d4af733ab5f4f54898345429044d8f39c2bd95ce4d4ad420967. 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/QM24S2003224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e77c5498678be6477228a3a3724c85a63a653cf1adf3e31e296176626004ed2. 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/QM42K2035794.