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 0x3f03782e383b4e1d90027bb3c66ebcf69638cb5f1af00bff93feb9157bffd49e. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3fc2c714-993a-4b41-a7e0-6266eabc55d1.json and https://artists.proofprofile.net/proofs/artist/3fc2c714-993a-4b41-a7e0-6266eabc55d1.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 0x57d7a5f091d17c7437667a8e593c8f57585cd9030e02c5bc3fa2bea11d167eb3. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ES31E2301395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c71410cefa2bc333c80b6921e3bf03c4a08971fd6ec098cb84e3a2dab65309. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/ES31E2301396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde65d68c544fb9ec8118e01bbb4abe05eb4fb107929373fd37a84bd1d82e8bc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES31E2301397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4419a1c8f0d1538173b45b49df8893424a2e44fce4c25da1ed81b2005fbaeb5. 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/ES31E2301399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9a7607ad75081f181ad91ca818e75d4e5af62fda435e9450fa88792ef75ff7. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES31E2301402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89aa7201f4f058c53868ec43be9beb12d9927bd59fdefd1315796767f67ce2e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES31E2301405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b558383b73774aa0f59d48ccfa131fea5e40d69112aab51c86b408ac083f85. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ES8240922801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd353d9230c9bd10956ad871b30dcc957893c32a82144e50cbba903c26ad8614d. 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/SEYOK1213627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158ec5108337279905e30b1fe2cab012404479b89585d5c4fdd858035910b785. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ES71G1771318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04de23bae5661b7f4ff2bac7b2948dc114664da01e8acae9894e7455071337d9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES71G1771319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa254843217f326a7430591c7f95bf93dfcad8093fd53b5fb35a7d9a69b790df. 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/ES71G1771320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde710c2043791df36b11ced4b3fb449670e43e30ca31590a8bbf2a50fcd8436. 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/ES71G1771321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ee261ec198f7a6abc0b74194fd8fc1a28f73a7d6cf0cb309728ce7fe503e70. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ES71G1771322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289f6b58e645fa446a215bd81836676b9d05477d39110d3f8f6f08a487a090d0. 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/ES71G1771323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1665986ab70b282fb7bb689055d3b574a4c133c343271600e7a3ae2e5309059. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES71G1771324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fb1d7ffa50372a0dafb4bf1cc08ffb08b8902217f93055916abce383d0290d. 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/ES71G1771325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a089eaa6555991a72a38bd824e60dbef09f61f3368d35cf7db0d4eb340baab2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES71G1771326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606c940eec975fdfbceadbe6de3b6ff4a361c2b5a347ba44b5d660565ae32df0. 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/ES31E2301708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717b758fd883f66dc144294e6c2278fd4a28010684b1f0a7c45005b60200bf96. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ES31E2302224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cee76a37ece15dc6b21fe5cc9a516ca63cc51c6c72e98eea5e0651194dda26. 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/ES31E2412805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727e3994dc8e35f4171e56ef53cf0718e5312f6d49f6da3d7b00cdd8f32cd3dc. 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/ES31E2415566.