Chaker may refer to: People Given name Chaker Alhadhur (born 1991), Comorian footballer Chaker Bargaoui (born 1983), Tunisian footballer Chaker Ghezal (born 1977), Tunisian volleyball player Chak
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 0xf61077a2c8c495daf57584f12ff0f41f21d3ab20d795ed2c8a6310815a68d6a1. 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/9a4f6bd4-85eb-447d-a6d9-8a1f97a51f7d.json and https://artists.proofprofile.net/proofs/artist/9a4f6bd4-85eb-447d-a6d9-8a1f97a51f7d.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 0x1fce986860c553a050582d276cdbfc2c1bcb32cfd58d97ef11ab66ea83f525e4. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DEQ121423533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7b5cd0ff97f1f2f8dd4e162e17f6b3ede090a2544b237ff8f47ce1793a8f02. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DEQ121423535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b2387068c99535a84143cd36a92526cf2080b27620c093aeb0a0fd3e813c2b. 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/DEQ121423537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70f8cebe6268cf9db44a785ea4afba8a3e4a80adea717b225fa7d44d1c6b70b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/DEQ121423538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37efbb22d9331ccefdfca5fffdb84d2ccf060cdd8d3e68801b0ea524d4682aa. 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/DEQ121423541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf28a3501a818e8680c55cb0cab29b7ab87836deceec1a2bc00569b8278bf44. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/DEQ121423549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a018cdf3d97f317f8de4bc108c21ded6ba63dd003844995f7cbaf0b78da1f8b. 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/DEBL61300922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5714b799de4d9bb934303617d1413e52a7bed2200c0a98a23ecf630caa81418. 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/DELD21001002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08395b058b34916bd6dd0c80884d04b31e1c80544f0825dfdf850c5af5e3a53. 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/DELD21001009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6a9439c68a88145a12108e7ca7630df03957dfe9e8987fc2d95c5d9d903e1a. 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/DELD21001010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59daebb24244f9996cf3f5ee7841dd478978a0ef101242ca6aa6417227e84ce6. 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/DELD21001011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5b69ca91be8135a844786cf97f2c5029cf22020f3f4d51e3e5732faa1b5cdd. 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/DELD21001014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2c555123e9ab364e6c64599c3a86dc5959ed8566fa964bf5c810db5752dd10. 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/DELD21001015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefcb07dd46b815da3820b46962d3afe448a2c2e4942b8b26e238bccb3a09c3a. 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/DEQ121322436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363c78a683f2e46bbfa27f1d510fd2896f1b34086ba5eaf3e714e4dfa4f6442e. 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/DEQ021902167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f02744172925a1823ed1f15f9f86d05a63d18e0cb3888f7944b11e1ef7919a. 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/DEQ121009503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be5fd634030ff8723399a8c587e9df9fec79777167fe86842c2783573161d27. 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/DEQ121009509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326b1dafbbbba87bb63cd4eaf2260c20047aab03e13caa62bc356903506ee101. 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/DEQ121009518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482a9777fc7400dd7d568eaeb3938510d56b830b526f8830469507763033616d. 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/DEQ121009501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8733632b99f1de2f0205fd0f6ffeacfaff5f06e797d6368cf48d013a0ef0ae85. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEA810601951.