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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c3c9ceaa0a7547536ddf8bdea2db3fb6b0310a531566043d07e27fd147be9d. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f800606d-5c4e-4b85-a72c-538a324c7130.json and https://artists.proofprofile.net/proofs/artist/f800606d-5c4e-4b85-a72c-538a324c7130.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec06104453602c74263c658646b750a42dcd7091b8c6feae6d2c9de8828f553. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJV2281800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f83efa37f38bb850d16bf4384120d7fe8fe44dde68a4dee99761cbd0ae7869. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZGLS2420381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90089b1af56e6b0797943d5b8417c0ded07362cfcc35574052596d6fe97094ce. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ31941177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc8911762a062794c625d49399915d16919468e866cd54e4decf449e18e0892. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ31941178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811fae5983a6aca78e6da7fb238b1c3016cd8a5fac3a5d793abf52d3b27096ff. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:39:39Z), 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/QZFZ31941179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf94cdfce9263ea7960ff66bd19ec0851c32f21841bb062c513ffb4ae08db15. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ31941180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4444a169774923342ae169441433330a558d9258b8534ce4bb0f5464f13746. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-22T01:29:20Z), 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/QZFZ31941181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf560b69f6ee94602a1ee37fb28e23664dc0a9280857620cfb3d56dc2dc47f8. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-21T16:24:53Z), 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/QZFZ31941184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81137ee6ff10a0b2dcfb05e0819deca1668322d0f3ef55fe8b4649eb0ffb8c81. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ31941186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f83efa37f38bb850d16bf4384120d7fe8fe44dde68a4dee99761cbd0ae7869. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGLS2420381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e498c236455fa5f165e0b8e181a5a9d7cc4495374bd1e4f3c09e5ef2ba9c5b5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCADN1846690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310fad82113485a215cb01b09f965e00d4000a4d71262e2424e906d23fbaed85. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZMZ92398582.
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 0xa835ac226412e5cdaccb48c942febbf43e2a7267bf8800f6359b9d61ad24ae58. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZFZ31941182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74b1de64c8e9a8a96d4d8f8df135a59687e1ef778168edd76730a179e08c0b3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFZ31941185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10a886d53ffb27db07203eb71a409e71e9a7c94e68bfb374cd1986f9e599aa3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZFZ31941187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdefecd4816c50d1c5f06c308f9089c40e9ad63aa11e786182ae9fc98fc7027. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZFZ31941188.