Fio or FIO may refer to: Fio Zanotti (born 1949), Italian record producer FIO (software), the flexible IO tester created by Jens Axboe Florida Institute of Oceanography Fraction of inspired oxygen
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 0xe831830415c2d747bad61eb56a4df9dccd5732abdcc2a924caa6918fffd55b62. Chain 2 (Bitcoin): anchored in block 953991 (2026-06-16T18:47:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f2f2213-9438-4da6-9cd6-3b3419daf7a1.json and https://artists.proofprofile.net/proofs/artist/2f2f2213-9438-4da6-9cd6-3b3419daf7a1.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 0x9f5af1234df816c574a3e9987c12f672d5e64f4d3880a772c1ec3191d36b9c59. 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/JPM201400023.
100 years of love ... proof of dating (feat. Mr.Low-D)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e426afa24aab538d44286b9b3cbb0c8dec7eb7c27c3fa891b8d961b2c63db03. 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/JPM201400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f2402962577466116cd997bacc8c4aac01f53469313f5da6efdb81bc20c802. 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/JPM201400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b943833788b67ad7252bc798e6c34f1e6d024a66f60a194715131ae178da9c. 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/JPY201807026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba97b1ca051d3b95d12047df118dfdf46bb1dbf8f5d59ef6e24a48d92be7b54e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/JPY201807078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6759979219bb10ada8281025981f14e3ff559fbb403c325bf167b37f0d6889f2. 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/JPY201506034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9fc8762bcfc9fadc689e1d4a2506413937f8f2a3240c9ea58b23b6134eaeee. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/JPY201606106.
あなたと生きると決めた物語 (feat. Natural Radio Station)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2249eccc5ef7927d89298bdf3b3d2842a7b88e074b61df3b9eac95c67aebbf1f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/JPY201304827.
Near and distant love story (feat. LGYankees HIRO)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6290f396f83abf9178e5883c0a1fd7c2ec5625b5b4c3f29edf6c2f6acfbbac. 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/JPM201500070.
But I can only see you ... (feat. Zawachin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b2f2d34c3bcd4e8701cafaa4f009dcae18bf0bbc3fdc39f16ccf61edbecb70. 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/JPM201401072.