C-21, C 21, or C21 may refer to: C21 Sako TRG M10 Sniper Weapon System, Canadian Armed Forces sniper rifle. C21 (group), a Danish boy band C21 (album), 2003 C-21 Dolphin, a flying boat used by the
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 0x031f91a6541913d31ba6a1c462c2ae8e6c107a85b70ccef869173ad9b0b39e56. 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/0f38067d-bf25-456b-bd15-0cf05ca8197e.json and https://artists.proofprofile.net/proofs/artist/0f38067d-bf25-456b-bd15-0cf05ca8197e.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 0x396a4d0525e730a7c6c26d55ad05416ddda28a5fa3f81afb638bcdceedb6a7b1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-19T23:48:59Z), 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/DKABA0209202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f061af77811c650271e8477bf7a28452cfd62bd8a253757b73225722aa2cba. 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/DKABA0209205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd6afc5f56c3fff47b67b6db8fffc7cc3237d6dff810162c47a09d5f81b28b3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DKABA0209207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd6c3419735c687329380a6a25258c9ca8b86db9a828928e77c749047ec79e1. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/DKABA0209208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ee3f1d96af67e94163cd076c007dbcaea0be10fdcb81f152d50ed089cd3900. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DKABA0209210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4986560f0417e49be2cb2a989f9d37d9ebc7394b7757b27fa97a2d051ce64b9. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:07:16Z), 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/DKABA0209213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39528209e57028ceab84c9598288b52759fa20dc8fa7ffc9a2946a9a79cdde12. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DKABA0301901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc0b606cddb42f61cf4e433c5afb49b8aac34aefdddc33032fba98844f81da8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DKABA0401004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0452d1fbe59984492c768691523160448fb81c1df24af17341c69a600df8b9a9. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:57:34Z), 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/DKABA0401005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c93c4e47aed98d1a6306264542e80e112b4a44df1e7c37cf43568b88f0366f. 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/DKABA0401011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dfc637141d246166f7e8cbec59eaff63ce0e8da8f47fb116a269b63e647be2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QMBZ92373863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6c05bec946ad0a1a1e1621ca966e90f56eb5ca4b982911a82408ac3c3e5418. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMFME2444357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357eebc3eed265e961ec7aa6b6c73b9548eb41ec0351fed536dd597e86370f9a. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T08:36:31Z), 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/QMFMF2467747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc06c39da179700482f3447cf556c57a893c2bdab1d72a4bf306c709826bea1. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QMFMF2467770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda86c64f5184f43d6bcf45de630b436653ba7d468d8befdfabb2e68101eeb45. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QM7282416542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37296b328a795b942381d831ca928f8a13de78def40a68640538ee4143185dc. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QMBZ92457044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc06c39da179700482f3447cf556c57a893c2bdab1d72a4bf306c709826bea1. 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/QMFMF2467770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2373f94077bb6ce9e36f17c3e2fb636deee24ada85bde8a92701871e65bf5093. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QM4TW2582924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ebe2b89de217f2030092fed0269a8d49ef254b2970b198069775be993625b8. 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/QM6MZ2562216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88670878b7897ca2aeb5f9223d8f247d988908f696d0b39fd59b5b1a5f4e4df. 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/DKABA0209201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061adca68e7a4572dcaaf3a4a07c8c3cd9423ec6d0aabfe32260b3ba25a053fe. 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/DKABA0209204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0ef4b22156e5ca54afa55b3fe3c7f57821c6f0acf32fd5006c9ea0f71ff0af. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DKABA0206301.
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
One Night in Bangkok - Bangkok Radio Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354d9bdd09c6bb7692beb5345a0e8f223e22959c89b35eb298323782f90e84f1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKABA0301906.