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 0x9a84623b19ff8ebd9cac96f6314c62aa73794b12ed829607aff29897ccddb869. 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/c92a15e4-f1c9-4795-a584-4486c4ebc5a5.json and https://artists.proofprofile.net/proofs/artist/c92a15e4-f1c9-4795-a584-4486c4ebc5a5.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 0xf0a7c0280ca7031cc83df2b6652dc224223d13e931ce30cd76a99abb4d7721ac. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T17:35:21Z), 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/TCADI1707277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecde0d90e7d58f40287253a27ea3365819ed62c74de1be8b937944f027fb3f4e. 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/TCADK1724039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b3f035f58fc643f824510858635996b12b7f592fd351937a3030f68afe9a29. 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/QZB4J1839961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca9aaddac2b114ca3d0ae2297f90707fa3b6c34e7c612b2e88a01791b8b518f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZES51812638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373e92ee18e19b1a11279965fcdbd02cbf92c86447b8d6f9fd68e6d3207d5ab7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZFYW1927688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277838b81d71b72b4bd0d47f1e8d9167b0bedc9cff5a6918e2382116a51123db. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZFYW1927690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87d3d3b149efd3834494b0c1aea2a8e875c3134792c246b6b20de500a1105c1. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZFYY1922909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb61e12a49eeba2b0362c4e13aa2ebfd8cffc2570084f6138451c62a5862a4bc. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZFZ21987183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec276942d8028ff80f8c63931da0adf2458b33d8f7db3520ebb81d3dc6eb6417. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZFZ42082749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbd75c4c296f990788124cf66e109087cb4bcf80fd69f8dded7798384b0fbff. 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/QZFZ42082750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a64f5c41242c044415255c033e4e8264097941fe8400058febcdd94c3e9ac4a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ42082751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b80bf93dc82fedff38c22ce8f8bc7e377f6ae91738730105a223b40cda60d8. 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/QZES82083287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e16c3c018518e3cf9e54d79cb4622c0eb58b57fe61571e73b4a176597da772. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZNWR2077946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795c0bd01b467646b9b22467435ac7724084a2038d118bf8d8511b5108fc9887. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZPLR2021497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb21061695179dcfe9b6922e5a97f6b2cb802e84d138cfcd330ad981d9f4a3d7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMEP2111258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9f01911f38b9cf291ef85e8b378e64e85a4e363bc6f9e35d86c7afc6b8aecf. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZNWV2156652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561e6c79cdccd6eab9cba433368563e179af318aa3419cd73ab052a181c373f8. 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/QZDA82201563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d21c566552b20ca26dd1e26d1abbe73ddff09dd1f145edf7fb871ebf487e52c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZK6Q2300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c5e28351a90d661834a5fddba292f9a549a359a5ef58d2d675f9bade7d2c4f. 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/QZHN32435594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50190721f4e96a536a6db3a972d12f2f726287df7f0123df3ae0979b9df3335. 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/QZFYY2523980.