Erwin Gutawa Sumapraja (born 16 May 1962) is an Indonesian composer. In 1985, he started his professional music career by joining the jazz band Karimata, later becoming an independent composer in 1991
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 0x40e55d73bf4a3cbe700223e12e53c803bd38f57ebdc0cb84fa370cc469d576f2. 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/5843536c-ae1e-4379-b8cc-6a26c95638b0.json and https://artists.proofprofile.net/proofs/artist/5843536c-ae1e-4379-b8cc-6a26c95638b0.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 0x28e99e6e0d5b0bb51eb7e1ac46d721df5ae50d6d9a41045404b67ec18ccdeb72. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/IDAC52006509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc254718b3b440b5136ded8ac9d3d2d9aaf62b48b127f76e71946e92b9a2dffb. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/IDAC52006510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7271637e81a9c203e72a11a374dd189c484ee05169a7d1338997b41168948712. 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/IDAC52006512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763194f77c5c0f9c42887cec3e95d53ea76922291996e292741512a4a9895e7d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:40:01Z), 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/IDAC52006514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ccf546daf968eec346089342213bf1b1fa4a2ebf274726ba5bba378321ee7b. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:48:49Z), 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/IDAC52006519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98396b2538ae45e351b75947b3149ee871a7d8a8d2e548af951f69543d880649. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/IDAC52006521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7536f2894617247e61d5243e53f63547d8e4b26688447d48e67d2466206dc1d1. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/FR2X42132042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7276a1b7910b1104728a647ab073a0ed83e12417206065871c194348eb902bd. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:16:14Z), 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/FR2X42132044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3760a8405fba5203bd86197f00ba878301819f0f3ffcc219eddfd7bda704e29. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/FR2X42132045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9695f4d950c739b31037a3043916f4391141d77a6857f49a8551594e74101f6. 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/FR96X2255483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83638144fae23f2b12ae5d304d445b81aa9d78a39a5dcb784a688b08e2d06763. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:43:43Z), 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/QZK6H2286557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ce95ebb13edcd9acf72f6d72a07fa47fcfd922f3ff8aab5173a189e341fa1e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FRX202557076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb545f4d95f2f026129a695e1f87626148bb6e501ec05df9d0d86218435af1ced. 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/FRX202557077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5ee8dc173d77330c820b1e87192f3885e56d4d757d6cf71ef666f864eb6e71. 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/FRX202557078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c698518f46abe4c6a87af445b83a84f52b64e094b9ca114e45b8dfa13321326. 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/FRX202588233.