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 0xe1d3fb4671824644fe18c0de3461ec7b13e9ab5872481648dec5a1c66addba90. Chain 2 (Bitcoin): anchored in block 954010 (2026-06-16T21:41:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33f0746e-9acd-4dc0-bf2d-7c407803b068.json and https://artists.proofprofile.net/proofs/artist/33f0746e-9acd-4dc0-bf2d-7c407803b068.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 0xb00a9bb48f67a58612a0a8524d5e64cca0b34daee47c2047d540590f59735d89. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GB2YG2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee28d3d0ce0d56ed9cad15aad1534c97a8739298429f4551e59a994c2b29860f. 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/GB2YG2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2903111396efea264af7382f63916d83c6d9d00984aa33a03c1635e586574ce2. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GB2YG2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96827a38e7139d0264709fc8f891c7492f3b786ab380e52d39badefb27298a16. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GB2YG2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a0ba70c19ec81b136080229dfc030d1d19d16f2d3cc76a3ef16ee4fb9d3bfe. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GB2YG2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd66ed458e119279819963fa98e4d7c2f3d41872efb57ba5b5c8529c933b2450. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GB2YG2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb428ad1fcd6a0e27e97f9412c70d0a22aab78be9f68391d8cc9dade8dae75a78. 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/GB2YG2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9365e4f72e10ec856d6be1a36c902d16f89659de15e0a40bd1a6431d52affc8. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GB2YG2300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf95efe90fec14d1df23060a42db5b2c83263a6cb8ab6c37158fbe0a5cffbb8a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GB2YG2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11be374379e5a0049df856daa65a822085ddfeaa6b54942b376a43c989024d04. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/GB2YG2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8189f058a1ea0bdb9aa7a06111b269fecb299f14d4e0158f70f6e7b192a36ef. 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/GB2YG2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0d6e9a68af3f31468d1c6f09c9cf94f2da6740c0560beffba14649b3642bbc. 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/GB2YG2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0ca598a7dc7cf537af929fb8123855fe82d38f500ee9b152e326de7fd85c14. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZSUA2100672.