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 0xfd7ca46d4b5ada423ecdc9f08fe77b2e054461ea8ebbf03623690918034b2125. 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/e5921b8c-0973-4164-8565-0586848f7b12.json and https://artists.proofprofile.net/proofs/artist/e5921b8c-0973-4164-8565-0586848f7b12.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 0x76ee5e21256e7d9e65ffd368296aa6a09c34e9e7c5cb454329e4171cf0466ecf. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/FR2X41810215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e6d673c4fbab5d9686b60585ae51b642c945eeb784dbbf4a517117649702e6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FR2X41810216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25adef16f67d77ffab143ee7feb9b2d6dd39ad85933003e609b872cd3b4922f3. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR2X41810219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8e656610957712b911be491fc834759f04d84dca4d658cb56ebf5358078142. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR2X41810223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f0d08f27d7c0a7fa08707bd1b5aec546d0ced802be1e897c2d9c2540b5f11b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLRD51966181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438dd72b185605753eba02279cdf3877c2edd386cf558b23c0e60d65f1b8b894. 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/TCAHY2416605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c8100712558ed78f535defa99d9342e405f95c4eea4bf083c1736ca6018a74. 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/TCAHY2434820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec00c88e41cb217287a6ae791ab9b81927409ce227dbb398070c6a506d944be. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAIE2410047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1ba9c5dd71efdb5e21050ae1bd64994c88540ed96e48bb8d9a67079e3349e9. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/TCAIG2422313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1227255aaf598b2063412d7e9a7038c8521675a00736fb6b2cefb4dbf581dab2. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAIP2456216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6fda3c36b8fdcf726d827cb2548e501d1fbcbbaef9982ede6f1b56ea4140bc. 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/TCAIX2477645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174efdbbd831ef7123e2e528ee3fbd21b575545f88fd0b55335554c70a86666d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJA2496566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b75c11b4ab057a9b57d7fed07f93b5ea44e0f45d4b2281ccd01d91486a5047f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAJD2453747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a9f7cfe59a6bb0ed8ff3e670b17cd10704ff46dcdd70dca2b932063a9132c9. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAJO2589550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11883c87cf3b776354a80f5f4c7b337298b32bbb9604082608fe1206f7138ae0. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/TCAJW2570496.