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 0x825e8425a9b9d6fb5ce115d621bbc78db6d8610aaf3968fca4a378c3b1e008bb. 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/bb862041-8a36-44ae-b56a-12d81d355242.json and https://artists.proofprofile.net/proofs/artist/bb862041-8a36-44ae-b56a-12d81d355242.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 0x31094f017d36cb9855defc98ec735573cd7793048c34e9494db0f4e0bfb11e06. 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/QZBRF1897838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adbb1219419db6cf25387395a494f451a9ed461af00caa98e27dae19406ef2d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QM4DW1857544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1262c9c2626295739899f85d12a803580e6b4082e9c8a253d2a79d5e25179754. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZB4J1850504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87ae29781563eddecad5afd29c8de4e35ea74374db990c94ea3ae9fda1bebdf. 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/QZDA71889542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a91b113574031945b323e0cbb44595a6c4b39464623e493df4897e6b257e73e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/CA5KR1918864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d99c16bf1cbbef36e49306bef964c852feab7dc8dbe44a64ca5609d6ec11cf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZFYW1964260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b4c4b095ab323f509c8dec39c8fec2533e8c334848d95109f2cf3459b391e5. 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/GBKQU1929080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edaf65317f482ccfdeaffc5142cb886c98c63fb5d368b3e042230364aac365e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFZ21975106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a8416428ba86705e0071c244826b96eb744955a67356765a1867e763990266. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZHN71981597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8da384c6334330f07d8cd5718b41e54690a907ee0d505ed813c406d8fa3ac30. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QM42K2090581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6731aef186b94889634b4eb8b34fb7300717083f6716d840d3bbe0d8695cc950. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CA5KR2155630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d786093b2698e872371c0b5003d161cc10ff5617d5df9090ad7ff6afbb1f05. 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/GBKQU2179241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa6c5a047f0b6fd7b63b67c942a1e1b1e50a0cf3a947f97371b4e70fd4ac608. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/GX4R52163243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ae6b58e9df3ba1e68cd99dbc8501dfb167767612eeb3890f757cb54abce7ae. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZMHM2255339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfca9f75c266a33c3d5f9ca57b8ff3075b76e32959ad15b8cfd8fe70683b855. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBP4E1700373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f3b0dd1bef872f659b0f2c406e0c30e4e304fedaf91ee0e275b7fd5939e5c9. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TLVEM2400033.