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 0xc70f26c6854fb22debc61a7a354fe9719c4a90603cbc12c4fb82a683bc9e8046. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebef74d0-29a7-46ee-9ff1-ee9ce903a09d.json and https://artists.proofprofile.net/proofs/artist/ebef74d0-29a7-46ee-9ff1-ee9ce903a09d.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 0x179a5fcb7259e0d3fe241d81d0547c2b755933fd2b13d147b6fde2247aa22773. 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/QZHNB2388655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2ecda4261686b0717dc81c15982be003fdfe6f82cf53174aa0bc5bf571eada. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZK6J2320911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10f9b8398bea2a3cef6c2c1b90b36f3ec1e65af668e1cbeaee6b87a44edb45f. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZMER2303022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32393b831bb19d4b2caa34e539352fbabde958c2af52fed9675d52ad1ff87c3e. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZRP42306180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568fa9b4e7d42e6c4000a3c3783a413c09daa8576fd0a1d56cc79104c27bae89. 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/QZAKB2413181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd829e4b6fb605e06993d0c2e966e333dd4e0b69e5cfc290ecf56416b51883ada. 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/QZAKB2427426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e51ed85c56c38007088f1e73404db83c4a75181d1536b9aeb91574abf7f094. 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/QZAKB2407782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568fa9b4e7d42e6c4000a3c3783a413c09daa8576fd0a1d56cc79104c27bae89. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZAKB2413181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54f0ca9080b25e6e377813c549b45db2d8b0dab7ea4c860440eee9f31ae86cb. 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/QZAKB2464035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32393b831bb19d4b2caa34e539352fbabde958c2af52fed9675d52ad1ff87c3e. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZRP42306180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa773bb7fcc09f11bd6472fd636a3f38ea564e561843e08d6a9ba02e2432b3aff. 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/QZAKB2464040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb10d89f632dcf6b4123a0c5b770cf2aa4e409824a22704ce73a21b5acf5359. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZAKB2464039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd829e4b6fb605e06993d0c2e966e333dd4e0b69e5cfc290ecf56416b51883ada. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZAKB2427426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b338b1086e774629679db8c8bcb971ec9891e79a5ad7f265196fe8b1e5ed9d. 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/QZAKB2464042.