Cezar, Cézar, or Çezar may refer to: Arnaldo Cézar Coelho (born 1943), the first Brazilian to take charge of the FIFA World Cup final Cezar (footballer, born 1986), Roberto Cezar Lima Acunha, Brazili
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 0x04d62d1c19380933d3882333f34f097adc94af17de3910d4690c30a8c23d7337. 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/6c5af5f8-4941-4d49-adb4-268cfceab1a9.json and https://artists.proofprofile.net/proofs/artist/6c5af5f8-4941-4d49-adb4-268cfceab1a9.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 0x7818b9c82208288de01ed4750c541c5212ae16ed62deab8cf78870393b2390e8. 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/DKK3C2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a262eaab27bef99b508cfbad68ad790498cc4efd5ab9a921bb442191872b59c. 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/DKADG1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55d45bfbccc42a493c00eed13004f19bb1bf78384a5b1a051b5a972c0579f4c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DKADG1700168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6876ae1a714f37b7e45a81be96c174c3ab3a3e0ac53c91687342c1b0d6d0e2e4. 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/DKADG1700169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dcf635e19d995266b17718edf1b2b599bcb28e920f20853b5c6c98dbb83d9b. 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/DKADG1600122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51328760927f01c1845b98a4861993f1cb2ef89dcea0ac5bced8895df7639d85. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DKADG1700170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fce151141fd2003d0eae2595d5c6915d71b72002b33ce5f077ee4e8734c971d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DKADG1700171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac05376bb349b642e2f25aed36754187796d58e83255b851f3a23e951e7b4927. 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/DKADG1700172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebcc473b6a2cc5a8c1352efd6273a0953f7bac9d640df710ffb4f5c7bf897b6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DKADG1600399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb137773cd7c09f722db5e4f2b06f79362ce04eb7bb5cb1a0dbcdd9f676419c6. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DKADG1700173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dcf635e19d995266b17718edf1b2b599bcb28e920f20853b5c6c98dbb83d9b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DKADG1600122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81858bb5dedf16e250039a028567a4fdad8b70a9cd04d185785b248a7c155d36. 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/NL1AP1917576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebcc473b6a2cc5a8c1352efd6273a0953f7bac9d640df710ffb4f5c7bf897b6. 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/DKADG1600399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2ca7f6ce9956650ae9f78798fdf58658d187a70195f74a203cc7da1d796707. 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/US38Y2413828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524819ad853c16fd237f88df1801e9b9290585548d4957153acfd5f7ae837d1e. 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/NL4NL2010256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15cee735c31238653ed98dcb9066cfc8a38e2a1fbfa78d15911ca9a79bb9f45. 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/NL1AP1971290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b12cb22d17abc87d439a7ddf50c0410594e263c7874cf20886b97b6c681da28. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/NL1AP1949931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bafe0a1ec917215c00aa409d66825b7a43a70d11ae8ad60a7bd7b00304861e. 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/DKADG1800090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f83168bd2767fdf9dcf814371803fbdb88d6a47d57756157e46141f8e97f582. 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/DKADG1700422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f521c410a2c31f86cf1915737817a618e9c936b394d79787744c273ded8d41c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACK1521626.