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 0x167ea0214374470b6177688a5d03fc67f17d509070b14b807f190cf3a2b82886. 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/54e61ab5-5133-40d5-be44-e4ec69be60d4.json and https://artists.proofprofile.net/proofs/artist/54e61ab5-5133-40d5-be44-e4ec69be60d4.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 0xf0731362021451678300e2a7a80397bb5ac86bff0b07806ab5bfab72f5bd3038. 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/QM4TW2408651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84cc5f95c41cda19b62633ae9e51c9bef06a60a6b6cffa2efed919b4fdbda0b7. 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/ITF252400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428b73e539cd6a90a3c26dbc005ff371e15992ebcb3bd1cc686784bfeb5e2867. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2251189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b639cf8614bda4078117900c0594624ed186d48410493cc32a6571e90a8295. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/ITF252500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c7a05528142d1b162bf513dc6e74cb039bf834884fd7425e8c1cfe18227493. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TX2200925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337fe970f59765ca8a03c5bd58dd36983b2c8785b25e5440a64ed0ecd0a97a25. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMFME2198634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93844168eac12e716c83a8ed9903235cb860b267590f4c68f10f84d9846415e3. 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/ITF251900170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4335a73b3186a95e27fc91af0b2b9be229ccd91a22d98acff36f32744e667f0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITF251900171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa100a7deb3e962517a02059dbc157b434dfd5c2e3b2e1df6736a6cd9fdb6a589. 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/ITF251900172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c531d43040dfd39e4e3bc4581070feba94bedfa5c588ed1a67e816cfad8a9f6. 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/ITF251900173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdce4f1d87e4d50716b7857838f9234ddce297da09a5d8e6b49aad19d68e10bc. 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/ITF251900174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb142c07061fce228ab58a9ed85c42732ed44936641f6c0eb51301a87ae3c12f7. 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/ITF251900175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44cf0c760fd789a53c0a36c2702f95c3f41a4542504e4f844ef1b5c4bef64b5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5FN2130251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77db19486b74134cb398f08b5afa870254a6c56fbf3330497f9b405a3882d44c. 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/ITF252000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04224d9dfd8e76093b047754dfcbad1aa5412a46005ffe391529b5b29fe1cda. 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/ITF251900153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cb2f426d197ea1dc7e8afe445bba5006644c095f77260a8386073d982f54eb. 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/ITF252000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7962db548774a78b22ec12d4662998712db817c014b9028ea67e488436124326. 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/ITF252100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98462c6d6eb52cd8af85eda6799f8a65eb02f931e00043c8a925adee33794bc7. 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/ITF252100020.