FCJ may refer to: fcj, a Musical Artist Faithful Companions of Jesus FC Jyväskylä Blackbird, a Finnish football club Formula Challenge Japan, a Japanese racing series
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 0x1a1b1d5924ccf0ce7d9d89233ae6bbd448a510abe9b32e147059ee0457cead7a. 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/fdaf58d8-4d4f-443e-823e-bdce74828efb.json and https://artists.proofprofile.net/proofs/artist/fdaf58d8-4d4f-443e-823e-bdce74828efb.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 0xc9b4003663ccb6a6479d19211b0090953059ee066f3ceef5d8d3e396bde2fe8c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM42K1771235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2e339785b4a2b734e9e17e25ad784d7b490293abfe244862bc6659c1e128b3. 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/QM42K1723440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819b8918401913bd8957da5e342f4cc64430b686c43b7b4f109d24eaca64f8ed. 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/QM42K1767143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0081b111644525c4b80297b8d4f8117614befc9dfae777393ab238a0ca55e1. 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/QM42K1732102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc3ffafed755a37d10f30ea2e7447b813671420b0d3d9c00d904ba8393be931. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM42K1722889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de0c8d6ccafcabd3d4aa787d723d75dfc736b243c1d56ca368aa4326a530dc9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QM42K1883562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73930fd4ac8e201cd61d02ddc06e9b89d1c2c4947074d467e6d5a95e32a346de. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QM42K1867915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136891a0758552c3da6fb9c25cd530c54da444b7003aa69f62996313558ae5e7. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QM42K1856695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183a3281a651ea04b32c1ab81fdaaa601fe9b8d3925cfc8e3d0ddb8be00f9d3d. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QM42K1882408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76216efb7dd558f8f1e0cd530e2113241ce6c67ee5f15e6f8f3b132081eed85. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM42K1950022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9401ae054116a9e91175edc60a3e9e236b2c1ca5ea7c8b48953bcddcd385c98. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QM42K1954680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7085f385959c6726f2d7d38a57442c44c9b9568c40cd37600a42ef49518fab. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QM42K1944162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623589bb84398832bea713bea234bf6e399ec789f583b6b9b0bf04d54aa2c316. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMHL2015268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e58fe51441520290574a43da5bac0e925c917b45abfc064100add389f968a4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ72154909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5624ded1a9b529f0d0fd444b357eb540be244b4ccd345080cfde59fcbcbb04f7. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZNWV2032566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62418370cf9e3c33b011e33e61e6cdeea04520e99cfe8c048e00c154ec0a6506. 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/QZNWQ2045310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b593d20a889e21f3644523a4dbe4eb87c2ae3a53875b0faa52981b6893ee64. 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/QZK6G2062634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf808686e97757c2bcf8a7c56acc675bef567726a4938354a8c8168b498b0b35a. 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/QZMEN2068640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62418370cf9e3c33b011e33e61e6cdeea04520e99cfe8c048e00c154ec0a6506. 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/QZNWQ2045310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e667fa964f9bb7f523652f07a0e7a180119138a05379f842475cba2d589af13. 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/QZHN32282087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed916cf34099ff6f4e1f33efb233d22e5ca4f889d68ae4102b9ccd5fc9b335c1. 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/QZK6P2064663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36e781849d30d50aa9cdcb29b44bb95e7628918bbedabe885983092a8038cd1. 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/QZFYZ2399273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8859dc0602ed2e35df97df828171dca8c40190e3158284c1bc452301ec2e181c. 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/QZK6G2130213.