João Filipe Pereira de Freitas (born 4 June 1992) is a Portuguese footballer who plays for 1º Dezembro as a defender. Club career On 28 August 2016, Freitas made his professional debut with Leixões i
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7a9af8d28455289c7b7f1999a8b2e4ac0e57bd4c51bdecdf5e6a158cfbebe0. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e74f6212-3a09-41c6-88cd-6d25ff44963c.json and https://artists.proofprofile.net/proofs/artist/e74f6212-3a09-41c6-88cd-6d25ff44963c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bb3cd584888679dd469434ba3ffa22805a02d17a1718f2f20bbc57b454a9a9. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/DEZN82414342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3892f439f7ea94f6a2d072a4416756d34b794c1f01af4784651e64c12b2d86b0. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DEZN82414339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2da5535d169e6a3fc12fb650b2537bf278b21beda81d470d97597238d137bb8. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEZN82415352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e223a5e300c4c3659379c01e9b771f7d038ec895f49ee7ab53d9972e585778. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/DEZN82421700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3dd9406bd2dd6d5df4b165129f8d25702b9a1b50bf3d56bea484ce946110f9. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEZN82421726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aab15ed6c09e523265c995638ced4453cba453b7d562721a07274560c7b4796. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEZN82421699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cff51fe7688e21d65538b7479df18a7786eb6f1d01c77427c99e109bf775b9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:30:21Z), 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/DEZN82422263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5691263f2eb8f06ca73491cdb3d9105e3124a3a4deebb845f2706518cadac2f7. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T10:30:38Z), 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/DEZN82422264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca86768d2d156f315b5d3d775e7c5b048671546dd9e398b7543d749879ebbd4a. 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/DEZN82422261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd8741eff6e0828e6ca626f72ad807ee66e4000f7c9d2186d61228c325253db. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEZN82425199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c0bee573f714ed4d96f19662e5fc58b7c430a5c833481306b6bb9d164ae782. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:02:43Z), 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/DEZN82425202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb48d56ccbad69a7318de853afc8c65a47cff89d0464200574ee671070231b7d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:17:42Z), 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/DEZN82425203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813cab1473e5246b78e7582b0bed413308aa2d2f0f3363a41dca566b9190547d. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/DEZN82425201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0250a9608f38efa869c76325dbdb89c64a8cda99f653ee75e9d8ca66fd9de2b9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T03:42:49Z), 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/DEZN82429553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80de35d66cb327395b32a2715a5b5c792ae71f86b39e19cd260f4a1cb72538c0. 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/DEZN82429550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085234f5087297941d62b22d9b477ec1bcda5a72c15b6e2f4c78ec4efb6909a5. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/DEZN82429551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc770d4fc917e588e85659b21b524a9938a44910f110e3d3ff101455b589c0b0. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/DEZN82429549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532439b05ecf36d8b09717b405c6e3c692d89139340b20c7c14c70e30b1686ff. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DEZN82429552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcff9f771ba0b9394921e9884825e82299d9a678b3768b226def142a6043dcca. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/DEZN82429564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667b77428dbe36161e3b092957fea3547d81201d883fb467a4f942d8cfb31a91. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/DEZN82429567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604c7a1280b69a5c48ab531059c5dc91e9cbf266bd95db3b904f01a31ee74f94. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEZN82429568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72cb074d0cff032216b792ffa25e38f36a5445cd01b8da388081810e5a8b437. 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/DEZN82431294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73950d9196f937442942c4237223ad7bc992f31ef4a1a84d47b77ef485c8d8ca. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:10:45Z), 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/DEZN82431293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f801d4f503747a5627780e54ee1694aa963634cc9e29e4a539c1201dd79abd0. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:01:04Z), 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/DEZN82431290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f2ac7979fb9b89b6db6a9e7d6ff946b71293a5cdf175fb4f71253891cdd629. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:15:31Z), 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/DEZN82431292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f199cf5c8b3d5dd9335d636ae1381a762af09ee5f59f6ca4d06b8f5780fe8a4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEZN82432911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f572450f19e67050cbd2627081d13ee35d5d73f9cee79b32637faaca863fc5. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEZN82432910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2be3e5bacde2f8f36ff0362c728bd11c7b75497d8fa5200730fabf03163572. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/DEZN82432912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bc4a08c71138df94fcb74f522b60afab08d551aefa8bb0153a2f3c7b663eef. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:50:33Z), 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/DEZN82432913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89b0621c5393c505c88c8aa074f69f113d461f909e58a731e02ab5d17e7baef. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T17:28:12Z), 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/DEZN82433453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545ddb2f29c64f434545809f854bc1be162b6c5653e5d39046bcb09176c445dc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEZN82433455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b3192a4164b4f0985f1634f549e14bc92d0080dd76267c80ee4ef031f35e7f. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DEZN82433454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0717fb4fe20b322bb7f7098972bb0bd3d723fa120a493b30311c446a6a0e7e31. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:33:39Z), 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/DEZN82438350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54ee522fcb119d8e3e6ce20a49c0f54f4694cdfe00b931710cf6ed2301c85b2. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T13:43:42Z), 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/DEZN82438352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aacadbc5152213dbd53029599ebc8607290078fe36e8d4ca70c403f05ce341d. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:01:07Z), 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/DEZN82438354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb4762d5b1fb6feeff8e75a45c04820a7dd153b1bc5d469869581a19aed05df. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/DEZN82438351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e682e48a6fc0492e3cd92c3ff63d31493873e693f437f3d92873519e928516c. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:04:33Z), 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/DEZN82438353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb4762d5b1fb6feeff8e75a45c04820a7dd153b1bc5d469869581a19aed05df. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DEZN82438351.