Fon or FON may refer to: Terms Fon (title), a traditional title for a ruler in Cameroon Fiber-optic network Freedom of navigation The chemistry mnemonic "FON", used for determining which elements
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 0x6031454476933da4f8b228a704649ef90ecb0cf43e6ddf9bcfc0fc42ae15abbb. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2452305d-a5b6-4133-bb1f-6e5c4493958e.json and https://artists.proofprofile.net/proofs/artist/2452305d-a5b6-4133-bb1f-6e5c4493958e.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 0xd0fb20fe705f8f4f32e4ffe4bfd66c472f2a538eb2cafe0423ad42c53b59975d. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/GBLPF0259932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39de77af1844d7b13e3757f31462fa767afa1f6b6afb5f03caac91901490625. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBLPF0261794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea62159060e77659e3570205e835359f8683e22cb50fdd58507cb34cfe457e12. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBLPF0262355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2575f0f43fd14e4d331102383c5d0e02c5eae0b9c9524f5abef3ff74489ed1b8. 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/GBLPF0264380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720aa965335790e373496510efd04d2d571445dbad0c729c9a6a084a8975844e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/GBLPF0266701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c21514bf12395b10f180529e0cbe913329a22d001c3f7e9d6d2b8a83abf4c3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBLPF0276904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5721460330a0ecff4d7846e48725d0b980ecb0ce3bc54eb2bdaae6a5ff7e643. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/GBLPF0298446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8066e8c7126f3cf16d79fb3eee8e3f6502ab712eee777aea6e0f48c2007f6327. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/GBLPF6669286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfa32e66aab113103c189a1333e02476bd062ba5bc20c34cb0938d980ea3078. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/GBLPF6669287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c8b7ef74d70ab41687907724a6737b20dcfaf5983c6b5cb62acfc2ce4fcb0b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX202131198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc850f6f071f1d276eb439d8890c77af2208055d45194dbdf2bbca415119e1ee2. 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/FRX202131199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd5ba52a7e4c211357733147b23ca8d15116dd801b78e4cb55eb9f1047976a6. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/GBLPF6696480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba866e412fc6286d8d8c8dc311e955af101507d064559026b468420e49900cd. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/FRX762294433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a767ce3260d00ed425fa6a1eedcad5dffa1e317569058423db04e40b2b1bb1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX762294434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178c9022bc651ad499436694ec152f51ff6f9d357d6d053ed57da749165b85ce. 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/GBLPF0270779.