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 0x69e3a783a343e16c1d817f05efe26555976d2dfa6d003cbd8fa0a89be66c271e. 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/10ca729b-3461-4a07-8b84-59cb601ba3a3.json and https://artists.proofprofile.net/proofs/artist/10ca729b-3461-4a07-8b84-59cb601ba3a3.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 0x1344f8d86cfa77c6fbaa3f88726a6dd67571dc6831cada1dd49c8867040bff87. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/SE6XY2194038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ffb55ae4700cf73628cea25c2c8d8bf6f3e66a4079a619485e4a486cc3836b. 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/SE6QE2222482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8077d4c5417e0223c8b9a142d3c90f619b8341a2e87ea3d0071a40cd60aed77. 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/SE6XW2399666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8077d4c5417e0223c8b9a142d3c90f619b8341a2e87ea3d0071a40cd60aed77. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SE6XW2399666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f19e857f09c19dd8c33b0a0a6d50e8ac6580695a9ec576cc1020dc2bf356c20. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/SE6XY2322637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3444a30b4420b5b3d71baca46a72a009bd098c2c828c0565fc30712c14979245. 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/SE5BU2472134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee9f28e79138b1d482e41c44eaaed0902caa1f6580a5fa52c7794a4cb550874. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SE6HN2421311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b59e40386d56f42c8f261e57bcd84b3daffb74e9d933926454b524b493b5ee. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GX9RC2439333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2529b769220af8e456ad5f3187d4c1bfbe72b389abb672df862e524329800405. 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/NL4CP2433555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e01fffd68265fa3861501f7fd23964e4253c5dcd0fb70a83d11e2b9ecaa1f62. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NL4CP2433560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d38ea6ea849f87535ce08ec439e217d8a410fc655e50846e23961addd54f847. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL4CP2433561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc847c118374403add3c52f6cc3af746be5895b339d94b2f95bfe047214c926. 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/NL4CP2436186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a346c37179d27199f8f3b9db5da9179459ba1e9b5e62aa0eb07668fc581262. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/NL4CP2509368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe303b2a368f0b9bf7e1573189fc6cc0da76ae117fa4f6d403acf6fb8c4ddc915. 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/NL4CP2527864.