Sofiya Wanjiku (born 20 February 1993), is a Kenyan singer-songwriter, known by her stage name Sofiya Nzau. Career Sofiya Nzau worked as a street vendor and domestic helper in Thika from 2015 to 2020
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 0xae3abba9a53c6075671f01a46508cb727bc11ca2ddd423344d2e183c273b980f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1fdfd3a1-8e2a-4dd8-8193-057c72ffa97a.json and https://artists.proofprofile.net/proofs/artist/1fdfd3a1-8e2a-4dd8-8193-057c72ffa97a.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 0x6940ae01b1240462df1bf2358f97b8625b0e426d96cec6323f995df194339b6c. 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/NLRD52339373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776bcc8a544a154347d84b287a4646593b6d30217c963256de4c93533a60432e. 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/NLRD52339374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa35ba3efb229b1c2192142ac7f16bcbbccda69d2904ee0d207fe4d18d5bf60. 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/NLRD52350290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1e640237a825681337210db039894116b5555662692b587ad3b81f87fdc8dc. 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/NLRD52350289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b3bd505813f2a345d910e9bdaa00ff02f3fd114bd6ef804f128fbdf7198d8b. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/DEUE22403606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abf8ed3fc6ae2941d2cd418fe50761cc047a0f7a6c9ad249bd24ea4844d1a2e. 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/NLRD52339318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abf8ed3fc6ae2941d2cd418fe50761cc047a0f7a6c9ad249bd24ea4844d1a2e. 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/NLRD52339318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf5b1839c466cc79e6cc69622dedeec2d6667bc797cf7d7462cbcf4edcf0de3. 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/NLHR22290060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84bcba5355a7423c03303dbd3f050ebd0be899a05bee915568db0ace3508e2d. 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/US83Z2495741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da5535ff4510b4f658e57403ebfe2df96711083b02c454b2237b267e4e85c74. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USAH92300303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abf8ed3fc6ae2941d2cd418fe50761cc047a0f7a6c9ad249bd24ea4844d1a2e. 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/NLRD52339318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1e640237a825681337210db039894116b5555662692b587ad3b81f87fdc8dc. 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/NLRD52350289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa35ba3efb229b1c2192142ac7f16bcbbccda69d2904ee0d207fe4d18d5bf60. 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/NLRD52350290.
Mwaki - Chris Avantgarde & Kevin de Vries Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ced7dd7daf5efb478db158240fb0290ae287ba6357557200a7400e35a55200. 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/NLRD52350325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ab78ef815600842317804d16237720ec5c0d5d294865f589dbc26bfddad30a. 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/NLRD52350316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986978785496ff109698fbac161e46b33c54f5a8620086782f2ae5ef7d5aed9a. 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/NLRD52350317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacc39226c0ac9d122f2b87fe9eb59861380f5000c7c600bdd559beb39d5dab9. 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/NLRD52350336.