FOI, foi, or Foi may refer to: Organisations Family Opera Initiative, an American opera company Fellowship of Isis, an international spiritual organization Forum Oratori Italiani, a Catholic youth
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 0x413cff985d40c6f2c087fafd12a74f715b773cf087a87c73f08af4a7ee36b4c1. 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/ffb542bc-62d4-4d3b-a3b6-ded63ac12a0c.json and https://artists.proofprofile.net/proofs/artist/ffb542bc-62d4-4d3b-a3b6-ded63ac12a0c.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 0xeb97cb893c4b706f60b55f975bba4a1eb8f5339e7255b3464b4cb0b55f02df16. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/JPP302000079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c380662b7f45656583a8bc6ff3338c9b46f3bb40acaed79e40913200942284. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/JPZ922007942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3376eaaca55adffbf4dfc3d7b7e37f523fd224d23b3833dde3ea871095ba5928. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/JPJ902100180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6906b987c836a7f25550313f4859135af4be068f75deade9c5a2da2b177b50. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/JPJ902109540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c012868100c8d9063f9cb4f91122f8ff1e0ca3ea17703f6f39e004908beacc3. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/JPJ902200950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cd134e16e8654dbb01c385d2e26c457500da4b4fb50aa8958f448c022af06d. 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/JPJ902201910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc845c61891f8bc4509aac737d52d75ebd3623c5109b3123e03286872dffe00. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPR502302124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc845c61891f8bc4509aac737d52d75ebd3623c5109b3123e03286872dffe00. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/JPR502302124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6c88df1b36a42f8ae33f46eb1d18d7ce4f3b178baa88f6279744247f8d1124. 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/JPY492300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fe7b6a0b3e437e0f255ad6d4031f7bfd6ebc11663e7ac8db3d4225d12094d7. 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/JPY492400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93595a7ec29a8225008a0ef9c416491166342d82ce21236095a0cfa1ff12b931. 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/JPG102501866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd01a74c80eb7f9d1fc28bf2b7ce41950dee1d2afc5bd05d936abe5facaa3a8c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/JPY492300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd01a74c80eb7f9d1fc28bf2b7ce41950dee1d2afc5bd05d936abe5facaa3a8c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JPY492300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3aedb655e109c9685f510a672cf208ff29d648f7e447c6876646045cf562052. 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/JPG102300946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaa71ba432f2ceec4034a6b486f1fd59438964c6532187a00313c982fb17a6d. 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/JPG102100493.