Chaartaar ( lit. Four Strings) is a Persian fusion bandChaartaar founded in 2011. Members Arman Garshasbi, vocalist Arash Fathi - Composer Ehsan Haeri - songwriter Aeen Ahmadifar - Arrangement
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 0x81024592bd9dcd5be5258ff7f8913e2559cd75dc569ac54d1be7c4d13a29d9f2. 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/4fab7d1c-41d0-44c3-b0f8-749ff6699bd4.json and https://artists.proofprofile.net/proofs/artist/4fab7d1c-41d0-44c3-b0f8-749ff6699bd4.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 0x7444906aa1fa5642bada27906769d191d6daeeb9c43e9c1e65a76fef6c3a7fa8. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USDHM1403223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3251efa464487f394cb42067633d2552efdde43e9b3fa630f888f6cf87a625. 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/USDHM1403224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bbd220b24bee8b8ff4e3606d9411a8b678345689cbef9567b8c7d39793f493. 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/USDHM1403225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39919b6759528796fd8e620b1ae3aeb7db1269365ccfbaa16aa8bd34db470d7a. 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/USDHM1403226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0230640f353c0531b109f3e92c2c9aac4ffb0d0dd407445516321cd5db314c89. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:37:26Z), 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/USDHM1403227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2647594b5a36092587dc687d531548e1ec4cb1b69a5e47e1b28e23703f49ae8f. 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/USDHM1403228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6aaa1ff56b1a4cc419257a9c5b7e7b0a7852569177ec28b2cc9a94c117aeb0b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCACI1539005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233b5fc139a47714940032a9c7726984f52c161cc2ff0fbfb34367d28de479d3. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T02:08:20Z), 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/TCACI1539011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cf973f484bafd62d788730922b4c888b319a9576309a86f4cbde7b04a4bbe6. 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/TCACI1539013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda4633e5719d788725df65c6022a81fbd40ab5888a7a78406fc3d40e5eca4b5. 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/USDHM1525558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1e874b7753678e27afe53a1ff49862e1daba3e3c8ab60054793a9430f2d132. 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/DEA372009270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860baf4216d8f7677c04763a72668e1ee7d86cb1e2d13675850227140376536f. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:05:37Z), 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/TCADL1879889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ec2074f183b7be58d0c07b942958a7418994316e164a86b85ac8af8af8830f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCADL1879894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dafcdbea7668ef5c8ef82ee1d588d57942c50f27e60433f6b1cc1d0ee0cd3f. 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/TCADL1879896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef01767071958d942f629598dfa077186100a93b2eef5988df6f348a69c68ce0. 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/TCADL1879897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5657a1263bba30bfc846dade6f1c3f8caf57e8188ec321616054384e058765. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:05:45Z), 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/TCADL1879903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0421864a7a69737878032ad23bcf59fd663fdf251a15f8d8cb6c2c9753805fda. 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/TCADL1879911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703f423d29c8954f3bed88347535133d21f43d69879d558bf0473b84493f8486. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:38:43Z), 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/DEA372006982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d57b7bc4ea981e6679bcb6ec7ffbd00ab838cae0b2aad180be930514ba0c15. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/DEA372006984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a97b6a8394232d3b32225c6e360c114e2d309a1167864a7617042a4d7262be. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:38:29Z), 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/DEA372006978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe309899146c79ef60afbecf87eaa62f2a1ca699c4f52959f077d0b6a8e59bc78. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:55:40Z), 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/DEA372006979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c26c5f45bf34ba46f7dcd5df68bdc1d252d738435fa45c1a69201990e2c39a4. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/DEA372006983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10556c1319641e3d4b1b4f8b55d06b535a984e6ce91fe76818bb291d5575b00. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T23:04:06Z), 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/DEA372006986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8edfb6325e6a7836eb0d9841299e5e2ef1ed887d95f5d996a8e951f79a4e641. 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/DEA372006980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f241fd92d7bf30fd5e4e057c5cfe24968c5c99d5d42d654e072c21c5f73c855. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEA372006985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc33a1cd3d54f8ce300caf6e36c90300ab10e1a89622643076aacc09e39cc3b6. 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/CAGPV1900263.