Letta Mbulu (born 24 September 1942) is a South African jazz singer who has been active since the 1960s. Biography Born and raised in Soweto, South Africa, Letta Mbulu has been active as a singer sin
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 0x49d70c1a99e7af626b0d5584ab8c731c1a7b0e3c0980baca675390b8a6e2f764. 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/f4f8c644-5097-4fc6-a2c4-84ca14d5437e.json and https://artists.proofprofile.net/proofs/artist/f4f8c644-5097-4fc6-a2c4-84ca14d5437e.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 0xab50146dfb581577f1201109c8a12ec0892e13a87b018d6e6b56628a385fc6f3. 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/ZAC050501244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c18ad70311640e0232219df211442860a76de805c0273cc24c1eaeb1f9d238. 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/ZAC050300514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa94ef10f980baf5057fc20fa2e86f881023bb511f8fe6eb371a48c9b9cd639b. 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/ZAC059600041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c00d6bdec778abbfb0827dce11a7733871fc9abe788fe8960d6426c708086f3. 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/ZAC059600045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa16d3d85db37674c87c951c3d05d51e8aca42cca9b9e079412b18938dfe91e. 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/ZAC059600046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed4f5742f7f734a7cd65f1f8a0949dcbcf5e3447363b70b1b623df5b69c1964. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZAA010700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184e728d2a939b1acf5cbeacf2d75055b3f8628b415ba4f5273395074891b78d. 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/ZAA019600393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566a3734f7abb60b084fe8edc0397f915864135a2ddb7847404fa0e79ffb20a3. 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/ZAC059600023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3a2c31cf2f387e7c8fb9a46b818785d304b9009352d53a43d9b717af867835. 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/ZAA019600396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afa1b750cf20af64f556e777373f5027b9efad279965cc16baad26a4f90f88d. 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/ZAA019600386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07309e920412ed4dd8105dc808b85a8796e7222567c192c69a0d5b099d6e93d6. 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/ZAA019600387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc651a945443eef530d9b27fb28a07195634558c97db522fbdb63c21b67ee39. 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/ZAA019600388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874655cdd636ae3567dc5299e41e9fc569124703b516c57f98bfa846bc17eb90. 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/ZAA019600389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f28de97d789c00ca76f4d34456634f488cb0676205363d3094d8ab080b2b712. 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/ZAA019600390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7d7f8ab8ebec5600f878a83872f505803b71ed14b61582c99501fb2bebaebd. 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/ZAA019600391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8453484c10c2f3f8d7a5aa9d5743153246f786a79c48a1a9663bcc7cc3efb1da. 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/ZAA019600392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd989b8c4da9c7d25deca755730d4adeec5e193f777f498dd62d242119262afb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USUM71812802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4a3d43a0867b746f642391ba6d76b5ddbd6faf09e6ef2a2b631a8efee39527. 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/USUM71909878.
Let's Go Dancing / You've Lost That Lovin' Feeling - Medley
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffc57a2f29bf621413a7dd1cfd883a678406e636e1c9f05a597cef5db9d4f98. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USUM71812800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd4870988785ea8968d1af8141fa079138f910deae06fd9c367f919b7b390df. 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/USAM10000256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5871c6915f248fdfbda67fe53c62bcdb3b4d140a706eb67a20460ddbec3ca0. 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/USUM71812826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38da047a8b86d822bb16fc264f0b608c1dcc8a2530f2f517f8ef0531f18e4f57. 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/USUM70847740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ee5e80de12206acc0bea7220873a4cd863de7a1a939352eb8eff50c8d7601f. 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/USC4R7306092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d20b10dc5484e0b83e80a656b4727920fd105f37e5dccece0bc3e1aa5a8a3d. 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/USC4R7306094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1bd87919a2b44df434116a1899a49711c9900ac9a96c53808813b8d94636c0. 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/USC4R7306095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce0994d076c137e60889a41e6272a9e1dd54aad8e35ebd95542d389724914ce. 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/USC4R7306096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9253493c307b92b48c30cfe668e6a9a7dcb1a59340756359cf14369a31935267. 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/USC4R7306101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83cb312467ddd62891471db177bb1db6b784fec1bfc2a0e2ce57051ba63462ab. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:36:11Z), 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/USCA26800197.