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 0xbb18a40bc3099e59472132c2c48e1ad6c2da5a27f5c319a2073241899c74381e. 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/f43af94d-fb2d-445a-b976-bc591f6be71b.json and https://artists.proofprofile.net/proofs/artist/f43af94d-fb2d-445a-b976-bc591f6be71b.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 0xa463356b4e285510bd5a521fae25962580b653f8f7b4177cdcf79fee41dd2897. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/USDXS2005051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcb8cc614fc9e435e7ff96ddac4f64285227c0cd0063ab6052b7931a6729d62. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USDXS2005053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e802666b8b972e759bb878820727667d9f728e66b1b4a7e9f11c18b078ed32. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USDXS2005054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a1b6a517e9d6beddb31d007e2a6e4841b7c3ad13d5c88663eef7ebb2f5869a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USDXS2005059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09baf1f6a74155965bd78c0363cc8a74a4e00d03e09eabf771422d4a4e0f297. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/USDXS2005058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cec83240d7870da3796d6dcef067c8d8865163080f2b02be1b05f52fc29f5c. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/USDXS2005070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03e32fcad6eebe383cc040a5f43f54a3114643d3d126f6da9862746d5501419. 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/USDXS2005065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55c2ac130a154ed94454c3ed72cd178b771966331ec68e49be4f559ffcd6424. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:34:39Z), 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/USDXS2005066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcdc10e0e13e4a304781f3ff682c496cdccea68187e205993053e502b594ee9. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USDXS2005069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1ea373f834e89f1f591eeea690fe2fadb9c64375e9bac7b42c50b05329a0fe. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZHZ32015160.