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 0xf36148aaf44dcaaa45fba60ea923b19adbdc8b41e633a09f4f5a1f7099c34db6. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26f01e2c-24b5-4db9-bc8a-766ad7cc0421.json and https://artists.proofprofile.net/proofs/artist/26f01e2c-24b5-4db9-bc8a-766ad7cc0421.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 0xa2a36e8f50c39ebd8c0412540137f2aa8fd0927e28a57f3a50fa23c422b90710. 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/PLC062414347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaed91c04737262f716e9ed761061a1b7a337023ad6cdfcdc7d3e88ad2287ef. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLC062511409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b6b216c84f7d720329da50225b0f3e21a1147d64ff331ef1e99a78e26817a2. 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/PLC062526469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6f1696324a9470b164ee4b056c5066faf7135ed1918494e4498fdc0c6d4265. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PLC062526466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44096bc825d96a7cfd6a62e8f27ce2c6bbd2ec303fbf4bc32402e3164393921a. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T00:42:12Z), 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/PLC062526465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce940450e7472bb3f6069b2460af71a21c47bd224712c5388a814e8104d23a1. 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/PLC062526462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd621ccf11dbc1b6b27043efe3fe0fca93613596de46780ea387b137d77474a2d. 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/PLC062430514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dde69f060748d13421d4a0ec9b5e8b88ba6536068b2bc277b94108823bc563. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:02:37Z), 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/PLC062526468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4804fdba45944a1e6c5597322c8cfec08e11c92d6e14a414130edcd6a3c6ae22. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/PLC062526467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23153c3d5a7c9cdfa2172d8aac0975ead3c279056b31b697ff84d73002c17266. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/PLC062526463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0abb720d264c11344323144007f316082869fa9d6358a4b0176bd68cbc9a9b2. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/PLC062526460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaed91c04737262f716e9ed761061a1b7a337023ad6cdfcdc7d3e88ad2287ef. 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/PLC062511409.