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 0xcc4b14ba3bcc2e3ca57b42b56e476691bc3349007eae920966ee4ab987b5146f. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c38d9b4e-d79f-4653-b5a3-54b03e51b3a2.json and https://artists.proofprofile.net/proofs/artist/c38d9b4e-d79f-4653-b5a3-54b03e51b3a2.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 0x26ae341fbf15ffbc817901dd5045dae626acf61b721551dc3f244149fe0882f4. 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/QZDA52106938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d491b78085fb5cb70ac96201ef4fb99041f60e7a7e19944d728654fe3b518f7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR96X2130626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74607f71e84eb745baa6b72945d05a7e1ce5c64baec204235b6e45dd754a8cf8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAFE2082954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6083803374a99eeda4c71865f37d92ca2a45c256bd0d7804970f2fc1f2d4d8b5. 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/TCAFG2049857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbe516e58b9b6994ecd939306e568b209386569c1a470cba1497a7886de86aa. 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/TCAFG2049899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca6de17262e4288f8cea21f6d0efe2e07e83eda56f830e4f57373804b223a87. 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/TCAFG2049911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f0906185c55382ba8630fd5aaf40112acbb66a951cc3ed8fd287e53338f283. 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/TCAFG2049918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e11791670b401b3d8623f866baee7fc8fbd5850d5dd5d654743d0333ab5ec8. 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/FRX762175931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4759f49f8cf82cc24096ffa25cb0900a75ade599beae799a2acf0b1b83d4d8. 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/FR59R2133072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681e8e9efad9ee39a2b5b47681d1dc1b76d92fa40ec03d61556b1174589ef6bc. 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/FR59R2133074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ac9d680c1563d0cc98a6b752097bff3c31fcc08521124bbe6c962a0bfe7c5a. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FR59R2133075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9231ee737c8e0d26439c0006340b12ddf2e8915cec9169f64fa1c87cef012721. 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/FR59R2133076.
Atto 3 - Lo Stato contro F. D'Alessandro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca64942b19a88df6953ebef27fc59a87ca5a6410095fbf80effa29517aa5c7e6. 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/FR59R2133080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74607f71e84eb745baa6b72945d05a7e1ce5c64baec204235b6e45dd754a8cf8. 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/TCAFE2082954.