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 0x611d36ee01af78f9c044185eaa6fbe9041fedca52d62d5fad547d9a9230c1381. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c31195a6-3c33-43d5-989b-cbdf51f1631c.json and https://artists.proofprofile.net/proofs/artist/c31195a6-3c33-43d5-989b-cbdf51f1631c.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 0xa265c771e9b3d6ed74505b4435965c726bb7ebec2ba2d0f75dde5fb127b452c4. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTLA2417915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820ba7ebd8d69715e115fb2a374669f7a3e56cb350f160c3759ec5fe27c67bfd. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZSYP2411724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaefb3ba2c217ae8fbe8cc0d97d2849de59272f1f1cc9c1e10c0848a1d928e67. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZSYP2411597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb55e71842b04a004b0e8814e8ba437ede833cf1f9868eb879c7de8bfd47d7e6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZSYP2477145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbca52a484bccf2bae67d5003b74909fb5431d84bdfacbc22c2acae51e23641c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZSYP2477502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ec9a4c182c6458309dc00b39ef6fbb95e6f0fffe0085215bc5fb28fccc7203. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZSYP2456080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc787523c5c3bf705d19ec8b98dad932bb6704bc29c44ebd0afa6a2a7db659c. 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/QZQAY2419014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbee09987d57f22bec9ed41e4d7e2b9a73b936cc01b1cd51306674729cdbc31. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZSYP2486381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2695f4d45652394c8bdc02a13e3aa32b4cc5c106c9b15cc27c0c634e2fc939. 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/QZTLA2444787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c97897b741367c194abe80667ff0b01eaf832c2400e8fab2f652a25b23bb02. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZTLA2468491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a3070404225a550ebe5e8d711cc2f685bf37561014ddf0b130342ffa2b690f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZTLA2484060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9541e4f894704cb50245cd2441c246f0c2ae5da470317ce657105ab2e58781. 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/QZTLA2430462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6dd127fa084dac319fd5a1f5dc88bf26c6b9a23c59ab0c9b4b89b415ad59cf. 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/QZS7J2480200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921cd4cb0b6b5ff348ef67b87f031d4d73d4a78397b65963080d3c696bbe5f69. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZS7J2447720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc519d88e128dbe058bfa34ba298a15d69740a9ab46200c8ccfacb9a8353f6. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZS7J2409607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d808c150f65989f33635e345309a67ced920ee6090b812cb9d03fd740a913ea. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZS7J2426976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9e891f280ea97e54b5ebf087c0d6d18c95c30842f6d5158062c8fa1dc057fc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZS7J2472846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbc66aeed5bc67be01816196d24888ab436dcfd54948c04b118c363377d483c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZQAY2503777.