thumb | right | alt=View of Nanno | A panoramic view of Nanno Nanno () was a comune (municipality) in Trentino in the northern Italian region Trentino-Alto Adige/Südtirol, located about north of Tre
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 0x10970c66c44c58eb9c10be47b76bf880f508d0fb83c70fe1f5356d52277832f9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/528be0e8-4c55-4ef6-aa2e-6e97079d472d.json and https://artists.proofprofile.net/proofs/artist/528be0e8-4c55-4ef6-aa2e-6e97079d472d.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 0x59aea5250432d4a979af719edb630c21899fd594e60f7b1b5fac06b8d55f9e3a. 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/QZMHL2260713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d1c71112a09f8ee02d4acbde5c9adbe21fbfe42a953b50be4f8448d4fa47ec. 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/QZKDK2213985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af5f5afd223b47905a71c9900d50e5d5cc4af1bc4c68f683e908822b4e04152. 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/QZMHN2239223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5759d55925a1c739a5c36b4b4eab8d71a11351b50161b4523f3737513d1ce26. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZS662208020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4542074941ed68a84ed872f44604442741c8ec0cce99e9544d8456d7b69efea4. 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/QZKDK2289325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa415bb4867f1e0a71dbbc539b069c42f2f068f738d3b08947619ad9402e8f152. 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/QZKDK2215741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3be7018fd08808b269ebac9d1007bf651a9fe82cce154aa7af0245eac71e378. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZS662476063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47007f4432f475094cb5270f8dce278577f575cff49e753b24f29ebd82705a8. 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/QZS672481497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd4e7b9f761565d509460783cec017f0d44351fe0fe7e52565654a1c0b31a61. 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/QZMHK2410102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb22f19aed177d57912b35a9974570bf41fe19ceb7463f5baf3a465da258c78a. 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/QZMHL2430022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa813fbc862a13c9a0910036de5391b5679655d1b34a374f6e434ab6a6c94d192. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM42K2429068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7685af8b96f39b0cb5426405cbc28bf04f4e3f0e33519851c19d9cf00f1a16. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZMHN2442559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb86005e11e5ae8f7e6fde1f0eaf9cf4e5d49667467165549b644c6c1b6b51a. 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/QZES52402216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792e8af7a16ed268e51a9db2cd7847c2774e45fa66457aa4ee8597ff511cc9cd. 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/QZTB72487937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe3ba1d115137159fae2c1dfcd3ad638ff0826c89b799c3da0772db7a33b60c. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZFZ42374525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891d451a73e74e81f9a530ee5918c17661c89cefc6c66ca5af784101841559d1. 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/QZNWR2023551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccd2825b0ed7f7bd4b44f7ee1b8dcf2de7b5675d2fda09645c24092ae98b07f. 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/QZGWX2027905.