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 0x9d9958343205d49d3779f0c4e8e68b57bf3fdfbb697909d8afb0bddaa87e14d6. 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/6e949f3a-c1f0-479e-bd3a-62f236a12838.json and https://artists.proofprofile.net/proofs/artist/6e949f3a-c1f0-479e-bd3a-62f236a12838.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 0x2ccb9be4729a571a12f5c2b71b858a194ebfd45a2981fe5ad98a5aa2e3581751. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/CZH112000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb011c3284bd802e1a322224088dfd1fa4c71058008aabb5f94e188643c19d4a. 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/CZD712100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c56e16d5354bc7427c49af3b49be4843c4269b9bb1fa54d41548ff16e7d8f69. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:39:40Z), 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/CZD712100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4b54cd0ade1672f005716b89f97926eca812e5e5a0ca838368ce13d0f52603. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/CZD712200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb1c3a1c58c11abdb7122679e01374f64dea5223b106a806e1dc60370036f7d. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/CZH112300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252d7309b2633fbedaa265883ebc9048ff951ced0b9b777c1a2c692611de6eda. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/CZH112300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e476eff6610f00b57fc2f50d31fccb7374d1492b060de7dec83f781a95bb233. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/CZH112500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51042385eed5d6b5bc15809c254612dfb24cb5c276b79f41d120c11a1f190e81. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:46:58Z), 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/CZH112500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa5c986cc33a94b4e7f130934cadb37110e91537e07a16b3413e1306c4ceab8. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T15:38:10Z), 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/CZH112500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbee6b3dade4d97fca391ead4e793bcb0e6996234bb4a74c4e641cdb3f978f7a. 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/CZH112500017.