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 0xf38f48c6de2b8545bb6046ec528958d7f4b749df1d6d6f0ef7bdca8f8e84064b. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c43e5f4d-6be6-44d9-9916-036a589110dc.json and https://artists.proofprofile.net/proofs/artist/c43e5f4d-6be6-44d9-9916-036a589110dc.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 0x8ae0ee9f699aba1319a2dfd6d1d105d348eb49935d91da2dacca95c4c4edaec4. 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/USLD91767238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafe2db386cc6d91f176db1c539c66ed2c4c94ed84cc97c9bbb4577763014725. 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/USLD91767237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087662fec6285f9fbf50114bf7add52c647390a581f53b1a095f67c5d9c8656a. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USLD91769758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2754dd38ce2ffb9ba10c7dad9f2c1a8f63da0f7cf7e76fff1a97010d35691c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USLD91770523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9569ca73247ef98ad5e77b06dd41dd7ebe47772026755710df09f6a26cc866. 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/USLD91771751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bf028c9eebc19ff141847d7482d9b1861f983a16d6b8656d44b4a81421c2c4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLD91771752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46925c6f4e0d838d17823d1b7cec0b81d9c62e398238f02f5dcfcdb8a90771c3. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USLD91771755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbc48c45d52713bf0ed1e5f16c3abbe763b504a6b0531f593d641ad382b6991. 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/USLD91771759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94bd8a305e0e36c4151187195a3860f2e6db8b9c381b6fd857db969cf5541f1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USLD91772595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de1cffd723ea89e43ca262ebd62ba7ae0fd0ba50a917b2c507395c9363c6f50. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USLD91776047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf62485541c2911916d18b567cb1f7b7a0dbc0cdff0dcb1953d321f25660d527. 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/USLD91776777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94bd8a305e0e36c4151187195a3860f2e6db8b9c381b6fd857db969cf5541f1. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USLD91772595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3f96d62b5623da4dbeb61cb78ebef59eb9edefd7ba1ce2b870c3006cf579d6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USLD91779073.