Emmanuel Harrison Brefo(1971 August 31-2025 May 16), also known as Dada Kweku Duah or Dada KD, was a Ghanaian highlife musician. Early life and education Duah was born and bred in Kwadaso in the 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 0xbc24b76f119dde8df47410ecd4774e4d5fa53585328fd0650cb6cb1dee8e112d. 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/5bd1b8fe-513a-4dcd-8e79-28fdfda0ac7c.json and https://artists.proofprofile.net/proofs/artist/5bd1b8fe-513a-4dcd-8e79-28fdfda0ac7c.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 0xd9b90d77fb70129eaa73a2d823bbad14c88580d30a64589a2adc12bbc9fa3205. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ZA56E1504078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f547b7c0b67bafdee4317a8f423fd49e15126814326a14194de456bac922a29. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/ZA56E1504054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52d0a5f00bad01cbb69d98d7de71b2a259fda001e5d3d4a765377ac7971eb5a. 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/ZA56E1504055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ce1eee09a6dde5455a68dcdca83e7796c941eac06b4ea1e927d24e4c8d6478. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:15:27Z), 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/ZA41S2014054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2181e602a899c78e8e5c23a5787ff404e194674164489e5e4aa2254bbc513ade. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ZA41S2014048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ba62d77778465a32c8e00682770039374b4529bdf8557c989ab6db00908fff. 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/ZA41S2014049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f7c13868c982778c57fc94f348b359ff484a80a8bba699548a9c2f65d08f0a. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/ZA41S2200190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292da2fab933966031612f47ffbf30609c57cd0ec12722f93dec1567e48a43fd. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:39:24Z), 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/ZA41S2200192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb2371ef60b8b4b46de203406d99699eae497cb0392e18bba842d26e00ad8da. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ZA41S2200194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e0de9d338b0c48c16efd0dfdcb716606cf3c488c98343c128487a5a40272af. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/ZA41S2200199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff59a6df647062d1eed0d18a39614d05a46ebd005c608cb85ced3a03390330fa. 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/ZA41S2200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4501c80c31b146db2d6e87a2928988d0ac7c6bc77d2a8c72e2712e1e9adb9bbe. 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/QZZ662348883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c8e0a8b596cfcb865b67d5289c5420a051da2941ed8fafea4862a30f5e16d9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ662348894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f095a41d8aba10cac5a9940fd138a3e3f6ce499a832c18c4daacbe04f56ab2. 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/QZWDW2593210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47ceb313b760c98b7ca429c49818e84a72f4f47c9c246144e1724b345ed1770. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWDW2593216.