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 0xabca5a30ca1735e7ba4843c72733b575c0030f481a5b30fdb296639b64e19a8b. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c88a38e4-6949-4415-b4b5-966a58f1b1a3.json and https://artists.proofprofile.net/proofs/artist/c88a38e4-6949-4415-b4b5-966a58f1b1a3.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 0xe76db9320684badafc81c82db498049937c4b5d96291e59616c31f59548feb2b. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZWDD2532056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a003ff56824d6bbe69ba893b250685a35f51afcf57458da3e94654f2312e89. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZWDD2532125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58033b03a0f87a0662919436bda1b8799b17f77f37a7b3b2eada12d194a71f6a. 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/QZWDD2532132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e89fd0faed26e8144873713cf0941191d5f73e3c0d38fe379ae16a7aa693c9f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZWDD2532063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6335a957c883d4152ad7a4b65e6520bddee19e83d5839005fd332073ab043ff1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZWDD2532101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0accae71ade1a5f70ac35139ad3193ef834cab4a808f4232e485b494bf85a4. 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/QZWDD2532059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c3c2b33b1d8b18b35746788449285f60ad681f57a57162fa3f73db7c1a5900. 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/QZWDD2532086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91000f1a4677c0ce8e71ae2f0a8ec3c445e07a7395a60629633c6b3c3c6114f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZWDD2532172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435a7462e3b4c403c3af276a60afdfdbe40cf66dd0618616cd0325de899c61c9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZWDD2532144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b328cf86af41b4e255e8dbf3a5bf95090cf117e0112c01bf18c1cc25e8a193. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZWDD2532196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b2a8647f4e45935d4351fc8ff0c0d60d69622bd34a06e0f7bbcbbed842edbe. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZWDD2532202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3467529587c2b9cbdb4f179e1b1cf452ad9423b78fd2c857749218e95d1b9879. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZWDD2532187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7900f319670fc4507e5bd8a7afe42d8724daa7047d58427d1266bb406da30e. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZWDD2532149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27d28c1bfc6c44a325e4a9c771f182612ca2b2936948fa3fe17049b9659fce4. 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/QZWDD2532078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd00da360897f492cb325efd38ad933fdebe9fe90481c20a52afcd8d4fa44f1. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZWDD2532022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55eba4f78b96542cb16380ed3187ad07e03dc5340c712af734902df1a146cc1. 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/QZWDD2532178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217c93c9dc51ca0a4a0f9282a05a69d9fafac8c8f5d1b426af708ef0b735914b. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWDD2532106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaaf765111b1ed91f4a4ae2af970b13090423a4ef0e50611c097e440eadde456. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWDD2532157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc830496dd10c6eb8c5e6ca7398fbae5dba1253a1fd5b80d57b4f4d958cd997c7. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZWDD2532153.