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 0xd414c57b5b3e819d2ca1fc456a9c4a7508c8c04f0b0f6854f0fdd4719660a606. 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/d2a1232c-023f-4332-b3e5-0a8297da9bd0.json and https://artists.proofprofile.net/proofs/artist/d2a1232c-023f-4332-b3e5-0a8297da9bd0.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 0xbecea06c6903ee2f20292d9e77b4150ff2c933c7fd14065280f27cf61a6118c0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ROROT1309201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3074b9bed56a1d669b777435ac6716823c1ed2667bd836e0ac60480eb708ba7c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ROROT1514901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a5e6443a4c5e04cee6e5baa7a681f5ec8acf3f3787dc3f15d9018e8c452e0f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHN52291249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8868e9053ec46fc0340ed1ed8e90d56adba8d54dcc94e9b43870700da24d196a. 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/QZHN52302499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa620b0f6134c0db62a018f4fe5676a2bdc9c30f73a75cc4862acab4ba936e7f3. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/DGA082320931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920dd45f2df62bedb4ea96e9eae0df477cbfb8142db4638f622d50e39c5d392c. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZES92442952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfedfb585d5ac5becfc63292a2b679e4c774e1441ac86e7fb1d9396ccb538511. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZHN82406146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7270fecc970c7b13a0b9b7ea184b9168de2fe518036abc5b816fdda99c89c4d1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWY2479513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fd5de11b37095168753882bc5b5df9f550027f4365bfb32e141b6855f1de7a. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZTBB2442012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1ab83d7484f4187ff58365850492defed6105a8395126952e96aafc499962b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3EZ2483448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb07be79fe0993eb5d319eb3ba55f65e8cce30e8e6d3cd68faa4583585db70cb. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QT3EZ2481467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08186868352ae047bd24ff2e8229e20f18578369c3ad605edac93c6534a6a4d7. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QT3EZ2481502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e8f4ad082c8195dd9d5f5a7a95c19ebbc38bab35f75c78527c2915ccc2bd2d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNA2503139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e6bf28d24dff07b23d716106643ef8b10f41affdb2d3e84f319af361deb22a. 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/QZK6Q2579879.