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 0x92696f73b6a05ab6b8f38c01cfb3ef2fb91207588c8cc944cb4a739403e057ed. 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/5c54ed22-9a66-408d-8067-91ab587cfdd2.json and https://artists.proofprofile.net/proofs/artist/5c54ed22-9a66-408d-8067-91ab587cfdd2.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 0x29276a9cffeaf38a6fb28a1bcb66228eb5b8087852df50720651c4374edc7365. 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/US7VG1457512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598ce41fc9375da9c15e33d6fc2e778cdcbc63bfb00dcc69db8ddd47e1cb4586. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USLZJ2165608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe2005975b7d830da1198644cfedc5777b912fbd818d675fe9b59cd71ec1b8a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US7VG1456832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0240e1988f178da7cd6e2f7ba366f1482bd67862f7e92c653429760a4c0d3fc4. 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/US7VG1456835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3f029d633dbfc0d684ce52024b59582ef112bd85b8d530873573a69fddea3c. 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/US7VG1456839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0abaccc564b0a4d49b9fc9d32bf827289e9ebd5f2714a1d1454417f1dbeb74. 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/US7VG1456838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d88c5b51ade52c308485652a398c30ec6212805ebc2a93c7d8c1cd6f64ea17. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR59R2372510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8eb4f2b68ce00445a01dfae218bb0eb9620118124f129a0bb3ef7bc1b33b04. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USDY42024519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fce0ad3857a63bc95753add28a5096b14ab5dbbe4f4be8aae4c01ad51d88b7. 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/USLZJ2091117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d5a320bd962eb5e611c66ee6ca467cda6d110e06678837d0b72cb6ffa789fd. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBWUL2154368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3b4ca0fd627b8f020777849d70dc37df8270d1609f4d3f658a3ca128a2fa1f. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/QZ5FN2269826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac558cd66cdc89ed879aaf4727f398699cb0cd0f9cad13d0e255d6ed19003e89. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DGA0P2447062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac558cd66cdc89ed879aaf4727f398699cb0cd0f9cad13d0e255d6ed19003e89. 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/DGA0P2447062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55459b5c325cdd35e00911af7b80cdc7c6b87258e6aadab6bd32b1a3a0ca82d. 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/FR10S2596817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9ecfb3862282ddf3d1858e34ff307ea81dbc34abf84c161e5a46f5331d8a5c. 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/USANG2450854.