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 0x38f1387faa5385818218f77b6fe4497cda5542619a4ab8488394590dda1c1e24. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e39a8261-1899-4abd-9d6b-24705bb2b97a.json and https://artists.proofprofile.net/proofs/artist/e39a8261-1899-4abd-9d6b-24705bb2b97a.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 0xeab3d8aac5c32983a715ad58e15d4cac7b7b1dd7de437ca08d5d4b9201f947d9. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZPH92000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59519ed73c626023b4861ab12c61945e24db1c95c3a5c717497470a80fa9562d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZPH92000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8119b156b2e9a32d44f0d1a3f4ec7e0d30dfc44d354a0380356b6b0dbb4f6060. 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/QZPH92000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75ce94fe9f2e8be5d860ad8f6f67f40940a5c2083409d3d281fec7b7a38b5ac. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZPH92000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b2ffa413988540e6481188b913fba6e982c80b589a7d6cf70d649bd9b38002. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USA2P2460643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196ef82941e0a1b6a8f54c32abe0c54ef2daa24b4c03b11840d96cedd380317e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USA2P2473030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8dd0f1f847f7e763c68817af0b5a4a5a9e1a94d54e036c204916c9a5195d60. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USA2P2508041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ea79203514a583c5c30bde39888a54c165c352c6afdb73403eb896e51cf1de. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/USA2P2516097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6043377b4b66053832c43c3f630a069544e867cc2f9065d5065ab21a8abd613. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/USA2P2434204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8dd0f1f847f7e763c68817af0b5a4a5a9e1a94d54e036c204916c9a5195d60. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USA2P2508041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47bb4694c0dbca9982da2d8c1296ecadda8382a4b22d154e31971d11a546aba. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/USA2P2443532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894b37f8939f25c4426f4aa2a774e13e63475c8611913c9f8576031ec8b9793b. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USA2P2516098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196ef82941e0a1b6a8f54c32abe0c54ef2daa24b4c03b11840d96cedd380317e. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/USA2P2473030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45de28baeeadcff7d52f9f32ab08aafe0c886d426f72e28633ecee5d935f3804. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USA2P2516100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b2ffa413988540e6481188b913fba6e982c80b589a7d6cf70d649bd9b38002. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/USA2P2460643.