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 0xd5989e96ce8afb22d2b552baadc0e6588eaa6ff35fa147e8943237cb7015eb4f. 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/782ce9a3-f41f-464a-b94e-89632a33bf05.json and https://artists.proofprofile.net/proofs/artist/782ce9a3-f41f-464a-b94e-89632a33bf05.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 0x4f66b3a37153c18cb111b958a8fd1a614c449ab3f957d14acc1ce9a619774087. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZNWQ2465795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dce5b37b2435e8f58289166de30206b662f94c959bffe7e8e35a37c13f4c2e9. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/UKZGC2404934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6aa07b221ae6b7da464021a8dc1e102f92afdad8ec1ec29b140a0c4f49256b0. 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/USANG2453070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2603fe702ec9619a5f2aba61731c04b90f84777139e76ce621141e01d3fd3da. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/GBLV62407881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f8f2b497e48dd7bd0e9251fe434413293370b12ec7fe4d57eeb2a7a7c5a7c7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CA5KR2508386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe484bb3e414beb6f2e7c4aee767598479b73bf3c52d7a1fcda5b53df8b361cc. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/CA5KR2508389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe806044d5d739c618fba4e4aca99e4b433f05f31e8105e18a4a57efb2f59dcf9. 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/CA5KR2508391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533894f3537e2765aaf1e759e5db4750d91a399407df27a9601cea8628f33a59. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CA5KR2508392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5551c7c248a40e8ddc339656840ab5831bd51a27b6244280e39aa4bd1cef87c. 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/CA5KR2508394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bd0f8a09dcf01f2e44da0bc5a298c5ceb0b014ef2b071bfc10c861139cc304. 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/CA5KR2508411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f16bbaccf0e38bc4c3f72ce7ea275dcf273f0b7fc6da2de91d243cef773fe7. 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/CA5KR2508417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec5a4ef4f94de0a61f89e89e9d5b58b49d5e584a738c90daa16bcf20029f9bc. 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/USUYG1711431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f8e176595f8abbf482e0736981cfeaa029780de7cb73c4dc139085b7e37490. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USUYG1711432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581dfbee67fe5ea0dd7f667c928f5aca467dae0b7825df7388bc7ddd42821a90. 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/QZNWR2539142.