Leo Siwale (born 5 June 1995), known professionally by his stage name Tsar Leo, is a Malawian rapper, singer and songwriter. He was nominated as Malawi's Best New Artist of the Year for 2015. Life
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 0x37479b41e868cd8de898c99d8d5e2c1ed0916a9ba56ed4f7404802d75c243c33. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a67036a-5dfd-45ca-b1cc-11f368d9a0e8.json and https://artists.proofprofile.net/proofs/artist/4a67036a-5dfd-45ca-b1cc-11f368d9a0e8.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 0x798a8779ec915735fb45e26d541bf0bbe99f8c1dd0970a070e49eb39fd474cbe. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZTVM2355867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61eda7dd24b5b794a3cca2c6e40602a24ecf85883acb6052d691a6340aa5deb5. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZTVM2355868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f3bccb9af4545ee8fabcd16732de5336e44cd2050f645f9e03ecd06beea086. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTVM2355869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212c41ca94bd936f7dca2d00c6c8f90a240b41f40a234dab08476cbce3b78032. 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/QZTVM2355870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c955da86f1c0919429f6b03b4780e733fded605cae63b3a19a38450ca70dbc0. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZTVM2355871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6ce733b22ab304fc513b56858737cb5b5d3692287ea9510270a7223857c764. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZTVM2355872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9976cfae14d1787b7de5cec75fce801392451f6b0a152535e467aa7ca554a60b. 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/QZTVM2355873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b131d8f85a12c6fbdbf09edeff474513fcaa32def15531863ede3c9f17e7c3e. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/SE6QE2175780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd9e2efb140844db4ab771363265ab5d873af8ae206f4c5c4c02a04947c32b3. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/SE6QE2175785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce866ce80828edf1d57ba4b7a45533dd7804eaafe3367232e08d8196b226e9f. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/SE6QE2175784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b2d5697bc07e5c0de77861b98fb349a13215237605cc5f64cd13b21ee1de6a. 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/QZNJY2171729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2a3280cbb27523efb6aa4b4e9253f8159bf1e34363bcaeabda49d4a6eaa028. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZTPX2281115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06be3377e3602e587279ef84e613d93300959530f663b998b356a4b63094e75. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZTPX2374022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde241ca3ad4f1439dc1e76a9a4fadb49eeaaeeadbd21f0b4d7faad8abd33106e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZWFW2411762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52f09617e43eacea6e7a2efdca5f2a0fccedcc46dd19c29488829b406e2c6bd. 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/QZWFW2411766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33369ed4ea290109e037600526c8fda2e9dca048627d5dcb9c46b82922a023ec. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZTB32564160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0032af1f664398898d86277c9a6f7e75cfb1380569efd146083fecfdc54cf0. 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/QZHZ32230009.