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 0xf2007f4865d13dd2e277f2d2bc7eed3fa43f95bb3e50af40a2d375caccc6e2db. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/83e3a37d-964e-41a1-9f51-8e5a135091aa.json and https://artists.proofprofile.net/proofs/artist/83e3a37d-964e-41a1-9f51-8e5a135091aa.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 0xfd6424487d04a4bad231bac2f77c0e55ae9450f6bec89289bec55e96cdee2208. 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/USHM82446216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ccb2ef4db7ab96c0e4c5aa3ae2630f905c25f5a193230f42e2f5b3b3ce2f93. 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/USHM82446217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cdc73a5f3a762049699137db0cc0d89b439e8690776343d7a0b87a93f9f374. 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/USHM82446223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1c10f89af24c89306bfc7971a841daa328b88e58f92218ab2f2e5525b1e867. 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/USHM82446229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5d21ef6ceb3676cf8aba25f49e36baaf2223b327505c3e525fe97783cdf62c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USH6C2410401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b928a72c582dbca4b453a60523e7ce0ddccc1d0eccf6f8a7a4ed5ab3d83f55. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/USH6C2410402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10242f59d383c23347f6d14f4d31308898b7fbd21fb8ea64a99e0c6608a675d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USH6C2410403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895524499e87a826544053d3257110e4c1ac2fbed377d091357893041019735b. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USH6C2410404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7412b39f8fbd300be5963838ba339c86cf09ecb3cb0404a432779ad6e33475e8. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USH6C2410405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8662d4edbd3b4e9b2e9c77c024f2f4cdf509a7d126d6925a8cdcb26f05f16f99. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USH6C2410406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347e545760c94c2798d393b57edc02b9b4418066f59cc30483e1bebed286af14. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USH6C2410407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd42570fd76f9c3eefefcd639a533191beabb1dc404ebd387b6d57506f3f735. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USH6C2410408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10242f59d383c23347f6d14f4d31308898b7fbd21fb8ea64a99e0c6608a675d. 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/USH6C2410403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a0bd4ac0877b1f6eca0f9eb97bb4bf3bdf49454d32a33316e46ed60bc92cb7. 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/SE66N2242852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7bdfac8290008be44d9b987711a19a2291d38f0dc2f2ec07064f8e71c59db8. 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/SE66N2242853.