Letto is a Pop rock band formed in Yogyakarta, Indonesia in 2004. The group comprises vocalist Noe, drummer Dhedot, bassist Arian and guitarist Patub. Letto are known for their hit singles, such as "
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 0x91166c3c96150c42e256b86f97159542eab4db09b604aed25377516a79b60f71. 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/58664d70-628a-4ab2-9377-4c0ff3d55937.json and https://artists.proofprofile.net/proofs/artist/58664d70-628a-4ab2-9377-4c0ff3d55937.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 0x5c796994a2d817ffcde784b6a96890b02f6256f9e3c0fa8e66ce59994ccc7361. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/IDA181243007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e549fe19b2a5f3737e91478327edbb41f9c0063510ec9354fbc030574449fe. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:52:39Z), 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/IDA181243012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822e47e916aa5d7d4d2ca676b5366d65cc69865d028d885e9815350651f5faee. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/IDA181427240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2bf65df70cc437f39a9f7a53577813d5f2370ae1a9aeddfcde9027dcde36a6. 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/IDA181427249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac1a8ac3827bd06d6096772605c893327bb33c4a29a88172fdca6de97a586f4. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/IDA181427258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf29416cb3da67683616c4072e67f67b359d7400e90add3d39b872cd69365192. 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/IDA181427261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32f010c64fa168ea44604b352f806b49adaac074d2758bebd522a83a505ad40. 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/IDA181427264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca73db0b47d81535ca95c4dcd26c79e97a568974b7a84711512307e016174ca. 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/IDA181427246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b9a4131503dcbb1012f539a2a3e50f56e01a148d2332bafd8c13c380bbca86. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/IDA181427228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862a361c8d981c977fd6d1920b568e78eec73139ddb1f6a908bdae04d42a1c97. 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/IDA181427255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0dcdd6105f23fdd48dc5c00a3247da4865a3e797094205c422ecb376b5c622. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/IDA181427234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb056f1308686268fe8c07d18073eb349cbf89b428cf693568fea9181f97c5927. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/IDA181427252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc098947fab3cb59818d2f713b4c00973f8267ed70334fc7922a762ce38c325ac. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/IDA181427222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069435e3fcfb88e3ecc2996f9369063a27171a6ba30d7848cf2fcd639925aa40. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:10:46Z), 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/IDA181427231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4d71f5bfc172fe2ed1bb67717a1528d95eeb2e1a804c16cb296f4fe81b3a1c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/IDA181427237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78eb5095369321c4b44b9347a15a77d776d02eee309c6f322b6c89298dd71a6. 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/IDA181243002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37ab5e463612e464942573fc4b77ebc22f231656b2208b5139d5bf3fc5fbe94. 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/IDA181427274.
Letto Acoustic, Vol. 2 (Live At Geese Studio, Acoustic)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0c97428dd60c13755d785fb31bc612a1ed06650c583e6dad43e9df27da0370. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZKWA2019848.
Letto Acoustic, Vol. 1 (Live at Geese Studio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b709defe6422cb932fa06ff6518dc11c39a540c57dcfebc28e2065c43df1a35. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/IDA181239505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2581bcc49c48eb0b0c19a102a544728acd828841dabb62d4258aba99cfb73737. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/IDA181239503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4787f017847236e5ae885ba6be5ff3a2d7e953e5a5e814c54086d484ebea681. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/IDA181245303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef79402670b95701560e813b4bab7777fac9cf64a107cf9d8ffce7547128af81. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/IDA181245309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97612b5f8e8488c359fa9975e7f4f8d9ec2d1d2ce9e32a5b27af9512f07680bf. 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/IDA181243008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40922b43ad7026fd2f1a5632a3b42042b73c8ac34109ee76499ca131900025db. 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/IDA181239511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b709defe6422cb932fa06ff6518dc11c39a540c57dcfebc28e2065c43df1a35. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/IDA181239505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749ca6932e57afc6d6ea4f2ba271a3fd35eaf87455704d62db4f785706f7fa7e. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/IDA181237409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3b9054eb76a81f9b890c93b42fee8a1bda73ebdb377041b263391895f24e46. 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/IDA181237403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8b46ccfe4846346c7928d1105694b5e797fe273250eb8af9a4b5cb488f863a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/IDA181239502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc919acee687e21c1246b532e97f05cfde46467fdd2a9782754a6b2c62e3d97b0. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/IDA181243001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31634f0a81e7bf3ad75155836060de6bf3b93d32b58ddb69866c485cf43e9010. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/IDA181237404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78eb5095369321c4b44b9347a15a77d776d02eee309c6f322b6c89298dd71a6. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/IDA181243002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d367ec18ff3156b3eb99ba2a275d0dc931030bf4d6d701594bef1f6d498d05f. 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/IDA181245302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac1a8ac3827bd06d6096772605c893327bb33c4a29a88172fdca6de97a586f4. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/IDA181427258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862a361c8d981c977fd6d1920b568e78eec73139ddb1f6a908bdae04d42a1c97. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/IDA181427255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5639deaa3b2e6fe9ce1c29771e6b3830aba8e2c56c45a040cbd7f989327795. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/IDA181243003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb056f1308686268fe8c07d18073eb349cbf89b428cf693568fea9181f97c5927. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/IDA181427252.
LETTO - THE JOURNEY (Live at Kuala Lumpur)
Coletânea Festival Dosol 2015, Vol. 2 (Ao Vivo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e44940f7493a1415b469e3b0543dd4d1be08c4f0278c35d01735f10d6ecd482. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ5AB1606537.