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 0x946457bed1f932334f5eb3c8354b9487c3a23b0413f77713ccbf0c33cea3505d. 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/6438e714-50e0-4260-950f-8ab63c4e08eb.json and https://artists.proofprofile.net/proofs/artist/6438e714-50e0-4260-950f-8ab63c4e08eb.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 0x675522c68f375e718a829a52bc940966d33938fad812a41b67e5676ded1d38c8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US25X1089304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c7a1c7e6a71619873851093437428433c5784a7712227085af8599da11d661. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/US25X1089978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbee6b639207c3f778c1734f6359f0bc3eec9bec6caa5bc79588637d81a3007f. 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/QZFYX2033638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc234e1d43ff24ad9f63eaa984af9ca83cb2fc4fa60e2fd1f8bd9b448d4c39201. 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/QZTH82184825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38bdc0d68e5a7e9f2095407d8e5f80a9ddd049a60c2a93af9ec1dfd995e9b1f. 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/QZTH82184821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e565c19549f4735dd00445a5da76388c1b0ef71bbc0d07934bc7c23d42b61b5. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/QZFZ32264751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c81eaf617f350c52409a560a961e4982d17d5d1aff1b94cf4874817f485e872. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T06:56:24Z), 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/USYBL2201658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1b8aebdfc2bdee78d466301069f5b77a7dc000edb92c3cf08547cd2b13a8b1. 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/USYBL2300885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c4941ef579856aa597c3f73295e961f8acac98f554293add9d75d38276587e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USYBL2300886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fca811095725c5c3fdc95e77f488949d38918ecc41325465791ef47db6bf3e. 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/USYBL2300888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e58aafb11fd765d9772b15241fed2f339401365c467d6f31d56253ac0f6eeab. 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/USYBL2301410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc7439f97148a06e28e7f8942c53ca60d9e80078a7c25982867e8ebe249a47a. 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/USYBL2401526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bcc435c10affbb2d7b5dcdbdcb3c623c83d2e1ed85491aab5cc49ea17ded54. 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/USYBL2401528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c15151ad1f4bad7803f5dbeead7a3a248b0955928b4feb505c3bad37f3cc1e5. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:28:21Z), 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/USYBL2401529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060b03bc16e371bbdaeaecfd50755f5d6fe4d5db7181794caf30f17b1d8d7f80. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:11:01Z), 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/USYBL2401530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d1f7a628e71d543dc12bb8a0bacf92e1229abfabc0b4023e23c991ba2d471e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBBPW2400396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75e1af57e5c274cdeb55046ca47b3ecb6d536c5f072b056c2de2ffdc5b67427. 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/GBLZC2000098.