2J or 2-J may refer to: 2J, International Air Transport Association code for Air Burkina Chaparral 2J, a model of Chaparral Cars 2J, an abbreviation for Second Epistle of John Kawasaki P-2J, Japanese
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 0x843a0414bd78b2187283403cf1f37a1f165fa37dc632a247a161ad16bb031c3c. 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/9b77af7e-8298-468f-8d48-6d43cda542c3.json and https://artists.proofprofile.net/proofs/artist/9b77af7e-8298-468f-8d48-6d43cda542c3.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 0x7922bf592efa068f116251f6c42510e6abc385def6780057c5a79852ca93620b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ32447704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bfbdb87ca17121dc28fdcdc6c48970bd7b662b7f413d3819124620b6c34644. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:55:25Z), 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/QZES82447750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65cbaae35b1295907b205c16eb9895e7da5b23b64d32167b167d888c9b9091a. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZMEQ2418611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85145d9aea94f7db72274305129e8d5e859e07d022b2f891b464e3171c56b23. 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/QZTAS2474982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7002718c713aac6b967784baad6f07e581121a3f38d52738a90bb9e558a3a9c. 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/QZTB22442294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744c9acf1560fcfb2069b10ec68f3b8491cfb59772a5cdc4177dd8aba1c7f2b3. 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/NO7JB2514050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499ddfc82b783351536609c9b9c3bcc31bbd8fe1bac6b20c45b376bc44ff4c2f. 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/NOWAT2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a1fe1e912af2bee4bb52e83e8aace26feef924cd75504c6c92e9775e9902e8. 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/NOWAT2401050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf038d90911536311efe145c9f9811b272d72eb4011e698a8b2372ca6b6a0282. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NOWAT2401060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23d2905d701bb52f3d26a63d7e8ff95ade91f185a3a422eeb28458f535cb464. 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/QMDA62415282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e9857758cd2a6ec92f14605d8e519b5e95e76f78f4ecf698d461a38b56aae0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMEQ2432981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499ddfc82b783351536609c9b9c3bcc31bbd8fe1bac6b20c45b376bc44ff4c2f. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/NOWAT2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a1fe1e912af2bee4bb52e83e8aace26feef924cd75504c6c92e9775e9902e8. 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/NOWAT2401050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bf7d9ba569ff5a7d9637aee19656f122e95e0275180360b5fb12dcab6b55f4. 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/NOWAT2401100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60363b55c37e89836cf4809eedacaf3b93522d35df80d60c6b2bdafe676b0f38. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NOWAT2401110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25a5e7b3f7d2ef3df9257b0fa62cb2dc8960c23a68dc1527fde5b39d97fc0b9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWR2424358.
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