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 0x579712d9e63a04bdad9bf8ee06696c4c04ea082adb35d334620f3c18fbb6e2c9. 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/76f9888a-0f7e-437d-909d-21962d64547b.json and https://artists.proofprofile.net/proofs/artist/76f9888a-0f7e-437d-909d-21962d64547b.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 0x312ae4efd4e596c4c4297c841d7de04e6839e1a7c790800fc5f43b0c5ad8f369. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/IDA040577102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e2e3676882ba83c163b2e67ed9ca04a9bac439942c4772bdeb791276e16b2d. 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/IDA040577104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f3542531f7e943b2aa3528d021168c89cf6ba412f08c0d9b2d45a38da956ab. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/IDA040577106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04674397c70757d7e840771bd40f1464efde2b8ee8eedf0ec66596ea82b88fd0. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/IDA040577107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe235f0ad7cc256545d95185531f5dde3045a651c2fed38645426d6e71c4a5def. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/IDA040577108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dea50ebf7f9518c7e4cfb3f32e2b95baafeaa751717983f9604d25e099c852. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/IDA040577110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d3a7ffb8f9454700a5a1cafed64a224c26056a5ac373f7766de9e9f5d4afde. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/BGA261465702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c3be05cecc8f00b556cf33ccf5182bdc8ed15d5e31e218ede1a0cc1771d9ed. 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/BGA261465703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e06e89868f4563c182767966d4f1c257bceeb282107b3aba0e5802d91459827. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/BGA261465704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34019409f24cec2c0f16bfc3c0d6730a41a98d90332e24b9b7a1c9fc3fc82610. 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/BGA261465706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82247f4df137f210ddc16b5ecd920c96908b7c53bc8bab1faa1a050e96e0711. 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/IDA232500050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbd6c685aa473eb0cabf325a046516546f2112edefa145087942a7a578d1b6b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USA2P2018565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0894ad58a4611bc9077cfe674c8a7ca795b8d322b4d20030656143cd65653a0f. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/IDA232500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b7af61f48389b8eecf1a704dd1ba54d29e05970acb31827e73d9747ee08441. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USA2P2018566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd509dc0f2c78e8c415e91075f4e0586cec5b1d3bf95d77583b95737800b62294. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/IDA232400383.