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 0x69ad072911dad96a8865350e047a945732465c7123a5f5105326f2d54218bd0c. Chain 2 (Bitcoin): anchored in block 954020 (2026-06-16T23:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37df9747-5a3f-43a3-870e-ec5c896744c6.json and https://artists.proofprofile.net/proofs/artist/37df9747-5a3f-43a3-870e-ec5c896744c6.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 0x050e847f63ef1e3cbea5e63a75f614b45563c6465d2940e0323988453e982df0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES47E2007890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676806ca7b4585e0d53c3ceb09d8fa583edf7c57242839562d54cff2e163e569. 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/ES75E2101164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2182b6374d6834d1a9a3877746e40b708429ef9ab5f029dfec6f49bf07d64eea. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/ES75E2203410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650d607ce508f73ebb7219341a64f66a216365973dfa2ac5bc91d8035e8d64d8. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES75E2200934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a28d390c3458b8b085b080f516356a27afa0f033a3105b19467bb6245ef6bd. 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/ES75E2201522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dba5efc51c9273daaae8639989370f4c2eac8f81262c26d6f6bf3a336a7a07. 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/ES75E2203383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d58825583431b26667f78d97fc0fcd13ac05db84a4c7e13dcbefbdfe91158bc. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/ES75E2203411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68271cf2ea18fac475ae169ec13f70b6aae8c94c866d00640ec6032a9858bc0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES75E2101985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f4e027473d64096ae9e896338f72fe570714b3072e4a9dfce89e361baa9806. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES75E2203412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4965bbaecb97630a748d7e041e5d0b033fb241b83249e2383d0b8cf2655edaff. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZFZ62304609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be9db8508c291be06e53d9ca081724ab8c772405b807c2e40b90027eeda2dfc. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZTB72225127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387960b79d3a3076b6939ab792a5708876590c49576cb3e5469525d6eb1a1ff9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G2239678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62784a04268dfe3e07c67e11e88caad272e1c7e84821f7c8e78aa414a6ad1af. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZMEN2253720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6848af2bbc9c77272e7a55e09b61d39084a2c1ffb9d94aff095cdb43ac03e82. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ72281620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6326fda3d4ee7ca26297e3de9d14592350e262c6795acb234f611d9e205d83ee. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZTAT2115087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3685f33b317ad4952bb34b1694c91cdc2e5ad059ab57625b1a7da65a09eab062. 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/QZNWU2124446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ed171aab67a5f24fa510e3680540efa0a090959bcb6db45e969b1416c9ed81. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZMEN2134159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942e3345054a28c9a05888da9ad670f9d88bc2708d35eb167091d948b14e8cc2. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZK6J2152046.