Alexander IV may refer to: Pope Alexander IV (1199 or –1261) Alexander IV of Macedon (323 BC–309 BC), son of Alexander the Great Alexander IV of Imereti (died 1695), of the Bagrationi Dynasty, king
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 0x679416d7bdd5a8cc35203e526e9a7bfcbc70f24d0c44c87986dadc19f496008d. 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/b80bc853-7f23-4503-9fd4-bacc3656dbf1.json and https://artists.proofprofile.net/proofs/artist/b80bc853-7f23-4503-9fd4-bacc3656dbf1.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 0x1852e82fa8027c4ce396a06d94d9b41e18131b5a93616d82c82f2ad6360f16a2. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/US3DF2259374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe034500662b4306f6bfa24a2bae96ca7a5351c0812516c1d2cb86ff9a2641980. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:59:02Z), 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/FR9Z62101016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d8ebd745af5a29a940068453c275a2c1ce5fcfc596f2b891030977f18b49b0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:50:38Z), 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/DEP962200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ecb13ee7fd5cb832450bb552e20ecf9b682bfe4e400dbcdc54131f3f59c11f. 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/USANG2225300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5270f6947a5fd51ef7a3496123abf0633761ecb189af2ed163fab88876a032. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DEP962200042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720a5df709ddb66e55aba75f78a0502cd04731f9b50b2a232cd2ea32e49df260. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEP962200045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb68f8ea48ebc8e006e74d19637bfea34d796ad5bb4f2e219b0a3968e1005c4. 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/USANG2264910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e38b26ade5248696f0fc693812d993be62ce2aafafe05f118a6ce5dc0690852. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USANG2281183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1822d6cd6dce8253cdf69885c5dfb50a6a95ccdaf93936d49a72a3c93a4f4c12. 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/DEP962300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf28b19812e31f33ebaa61a726020c3b4a86d92ab795bd89033ee163e7218355. 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/DEVF11900853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a00964bd0e2f41051de9926886715acb7f6dc3bd8798b9ba44e1f61d5818418. 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/US23A1577812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca84616ac288a24ddda38a9b0cafbd5e4197c7c9fe3a60cd8580255506dd3549. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US23A1577811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307c26fa5830009ebc10ec52511d9143dcafff3703232ed14057a34b2c0b6c6a. 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/US23A1577813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e83ce248a357752a907534d23c2d3f7d4cb977d3d761e86703a2a2dab99b0d. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:05:59Z), 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/DEP962400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118228c4fd228a8ed95c98ffb5874b9e994dd61656e529aa32bf4859e8aad461. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEP962400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b04ea9b4280f43e94a4dcc503e9c15d0e91dd6a698eb95253aa03e72b1992a4. 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/FRPES2500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdf6fd54666343704ee402f3d7292035897fc324c5944b7ac5faa9a94cc9d2c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FRPES2500170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf904c0c11124e2cba4221ce56035940dc50cc3430289f28fee93632f72ed03d. 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/FRPES2500250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976c939dd7c996ff26dbfb81d9c1c5a7f4612d74e6e4eec0446f2cebf4d3e0d1. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/US23A9729396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf095663f9eaaf326f8f1f5fd243753e6c59842772c0d128312e23b094fdc4dc4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEP962500082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc221387c18667636d3b6820be4b2a9f8c4705560f19b9a3ba63bda0e682a1a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL8RL2556049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf28b19812e31f33ebaa61a726020c3b4a86d92ab795bd89033ee163e7218355. 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/DEVF11900853.