Choa may refer to: CHOA-FM, a Canadian radio station CKSQ-FM, a Canadian radio station formerly CHOA Choa (singer) (Park Cho-a, born 1990), South Korean singer and actress Choa, a postos of Mozambiqu
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 0xd559f89936006f1b10ac6647bd291038e25d0f338ee7c5bc60760b84de5c1d8c. 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/a5b3c2ae-0ae1-4e72-a497-a7ff1f798eae.json and https://artists.proofprofile.net/proofs/artist/a5b3c2ae-0ae1-4e72-a497-a7ff1f798eae.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 0x50873185b3ec0e53a42e53f3ecdfdabfff7bd91cc2f07085f8e588709d599136. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/KRA491400395.
Sing For You - Last Story - Wat else needs to be said
Men Are Men (Original Television Soundtrack), Pt.6
Lovestruck in the City (Original Television Soundtrack) Pt.9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9f27c19a5f325bb7b3da68ac9e942469635dae06ee8872d235cf7062abd61e. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/KSA002101205.
WATCHAオリジナル「ダブルトラブル」 EPISODE.2 Crown - 光
WATCHAオリジナル「ダブルトラブル」 EPISODE.3 CONCEPTUAL Retro '土曜日の夜に'
WATCHAオリジナル「ダブルトラブル」 EPISODE.4 LEGEND DUET - 私たちの愛このまま
WATCHAオリジナル「ダブルトラブル」 EPISODE.5 History - Hush
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67ee52b749aa78cf78b6849aa7caa4989594921edc9069ba2d6285b014e19d2. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/KRA382204508.
Watcha Original <DOUBLE TROUBLE> 2nd EP Crown ‘Hope’
Watcha Original <DOUBLE TROUBLE> 3rd EP CONCEPTUAL – Retro ‘Saturday Night’
Never give up, Pt. 8 (Original Soundtrack)
Watcha Original <DOUBLE TROUBLE> 4th EP LEGEND DUET – 'Just the way we love'
Watcha Original <DOUBLE TROUBLE> 5th EP History – ‘Hush’
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc394d12727a7cd1e022a85b01acb766c776430fa063452a8c32bebdad3d442. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ZZA0P2311035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac396107eac8042f9ee7ed067a29e9b096a5cb122adeacd58d8e3d81f4c83c6. 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/KRA381211194.
Sing For You (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec1164612be4804aae2bfb723ca7164f5fe019b6326bb8ba692c2b13875a521. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/KRA341781015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efc1a43b2e6238200663c5276ae18acdb50514b90c522eac9ee115333fd872d. 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/QZF452004852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac396107eac8042f9ee7ed067a29e9b096a5cb122adeacd58d8e3d81f4c83c6. 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/KRA381211194.