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 0xe3b61e94f2f22b0769dc051857442572a6db25c5fdab1a2420c867ca6212f622. Chain 2 (Bitcoin): anchored in block 953892 (2026-06-16T05:01:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e51e454-1a61-4b59-9eef-4407c8b71e0f.json and https://artists.proofprofile.net/proofs/artist/0e51e454-1a61-4b59-9eef-4407c8b71e0f.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 0xc74191cb863405841c097e2e97b99c52346276c5a7d4a92a3eee93d83e4a5178. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/ARHXW2001679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc026fd04f4cded0fc1bb0c541a860bb09526fcc1fcd026a0912cffa38494dd67. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ARBPZ2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b9c2d4d033ead0332b88c7e95cd13ca16b10a7f51ea183ef6dc38092746139. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ARBPZ2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d5b0e6a2be26a570e3a4f6ef1bb089028cc25bd2cb3a7f59abef38cc8d99ab. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ARBPZ1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121d43b9b9d5989c62b0805d1d897874edcd841858fb522c5f878c147004bc76. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGJ1003909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524d3ffbec0ed45f0e9ad82c935b91bf536975c6a52150663bfb9504e67f7dc5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USCGJ1003910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f9b5e679d341713a1f6dd1e09c92451313bd266b83b553e3f75455aea02dc1. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USCGJ1003911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608df6ae1f76aed11ca69cc58726aaf5ff91753f01291e0752755b1bd0ec211e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USCGJ1003912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c80fbfe61031e24e1bf1a50b94928ea77a3e2756865b6fc6a3ba0da8a5a2cfc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGJ1003915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9326bd95de585047cdd254b7ae90648e6780e38c55160566bc8443ae8aca7de2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGJ1003902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3404a6e6db7ed785e83d8af5df64b59a2baffdfd8ad412724dc2879afe8bbff7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ARC571500926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b5c436f739f7e00d613dd4cc9f2c10b9b0d4e2ab5549b282811dcd4938c5d9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ARC571500927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a64a562243ff04fa828d5f575af7172ad68281852d6173cbc72e305f6e4de1. 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/ARC571500931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7917406995e67345a4f6b57af0cbad687f74263090488b92ea3596b4e1cadf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ARC571500933.