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 0xfa342d1a52b10316d2d20cc45d816c38d62138283aadf52da7d57c539fdd5695. 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/b92291b5-4336-4c98-9ecd-82ab838c908e.json and https://artists.proofprofile.net/proofs/artist/b92291b5-4336-4c98-9ecd-82ab838c908e.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 0xaa260dd897f3553825b9209a93a74cabf52542fbc9f15f360f60ab4fdd62e204. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZNWQ2148176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ebc3faa04b6d75bb2e2af2965ea374a3e20da6791a5790dde60a542addaa84. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZNWY2110188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a22d25fdf8afe377b1ec7f90b2ace8ccf0a73cbc4b8643eddfadb6a2b928062. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZES72266474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b953d5c046d394b1468d1c18aa029c1fbdb1ff8f985e31c2bbcfd4636bbed76. 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/QZK6H2278967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b589146439b36726134d43e11cb7f50f84233b74fbb94e0981d4187084faff9. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/QZHN82374269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb533654188de80ce2dd2975ee97cdebb9c01e3225b03d2bcc3e54baa923b7cda. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZK6G2326480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf0f08ac360222bcc61b014b92afba6f9a502395eeb2f4df319d471dd607182. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6G2326482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f01e8f8ccf207a65d8e7a26743d3bd406e9493edaa92e15ee53866dd4338ef. 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/QZTB32322290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc2ff5b8f34cce3cbabf39aa9d33e3a8ff4fd33816c73ca3696fe08ad136054. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZTBE2353519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3d6bb8cff664672996364ea306e26258ac9fa2826078c952a7e51fa83f347c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/CH7812411073.