B2, B02, B.II, B.2 or B-2 may refer to: Transportation Aircraft AEG B.II, a German aircraft during World War I Albatros B.II, a 1914 unarmed German two-seat reconnaissance biplane Aviatik B.II,
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 0x0e4df7a4a6af0014adb4db0713b23a6160cf226402b37eb740a5f3536fcd683e. 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/eefacdf0-5c26-479a-a983-c6e3917c4514.json and https://artists.proofprofile.net/proofs/artist/eefacdf0-5c26-479a-a983-c6e3917c4514.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 0xa351e2342370a7e2ad856c76185858c9a04bcbb95fe45a08994656342fb16d12. 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/QM8DG2090722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5291c556039e4811d67b3072086969bfef3f92662a1c2b6c0f68d2e63352ca. 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/QM42K2201182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbe08619689d4920a96169b6f2c5fb47da7838ebe576da4f7d2bde4b9eae91f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:03:05Z), 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/NLCK42216909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b925cc743b4eea2eed75c4164abc12919d7d7702b1e35dede0370ad0dcb5855. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWX2232176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef56c5b6e7d134245da63e300f70e53ecdac447cbcf994b4f8890278b4f08c4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWX2232177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4103bcfc457b9fd9467fd2c1dbb59e7b2f30ac1e233fd83ab0d810a533c48dd. 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/QZNWX2232178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fdf7b7331293ceb55001b477cea49483e5e89b98997e3ecc697acac2a15e8f. 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/TCAHF2374604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3ade6b2e9af868cc19488bb65ccd2925c99855163b85852bcb4ec1fa8835a9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZMHL2496294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fdbb1b83bf3627dfb49bbb9f3ea836c0f586273b49c628c5f66e2c81e25889. 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/QZS662424413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6367e9cb5541d3408a6ee4ca0d99279cd57dfb1cb5ae8b4e0f98d8ef178b1a3. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZS632482875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9215f0632296569710e751a4cdde6ed43e06356128f41d71bbcf9283fefbfd48. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/AUXN22489017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1b108617c35756db328fe9d5193808f676ddd09b29c9cfc65b1b81df685c6d. 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/TCAIV2437592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4079e2bed61bbaa57dc46d685c38778e1d405084ff6229d2bd73771a7114ac0. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCAJL2517971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1b2daf2faeab765d75a386ab97245b955992d1c1230a37c7dd1a5d5bb8755a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAJX2541650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc227344e40beb36593b299debf509e79f75de1bb0ca2bf7d11a6999bbcf9d064. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAJX2541664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5dfd034e09642bb2f6e5c8619dbdb91c7be4ca174eaeb5f01fb8c6df547515. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHZD1930023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8656862b3db4688d9db865b8885662d49687761ea393faa6ae24825f87b213. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZS672194807.