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 0x6463b3d873797fee5ea7f393fec7ee7b9e0b346e985fe3a1da56d496311f77a0. 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/8f9c8545-db5d-4950-843a-f8178ecee861.json and https://artists.proofprofile.net/proofs/artist/8f9c8545-db5d-4950-843a-f8178ecee861.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 0xf8d2ae5543d5405962d7c52af368650a2cdb42f5805fa31be1e763c025dd7cd9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB1917217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48346ab45a51c9b4244665a45984a0d4a2a37f5458e96c96443491d4ada69e73. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ5AB1917218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce68f089e9059b07182ee35e8757c3e022b7b8338707e8ef5aea7bfcf91c5c6b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ5AB1917219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a0dacdf18a509d394640901d9a4a0b72ab3d6437f3b3e5466faad9d26007d4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5AB1917220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7b5afae092faaafe5985e8ee2b2eeb071e5946931893452d5a33ee1541fa6b. 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/QZ5AB1917221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace530c17adf575d8e3300384c0d3084a39a89be56996395f2636538f430d752. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ5AB1917222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c469fed0990b61b41e41c5d9b20b80e5b0fc380b2cd37e5c434098c5cdbd83. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB1917223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d551ea1a59cd9ee445458453bc4b87c75303053b56a6683141fc03f784b6fb. 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/QZ5AB1917224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d294a6ddec0df19f1e555b7a0c301cf107016d2f36a2f94e3bac24f5d8f1ac. 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/QZ5AB1917225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff12035ad9e8ada0915c0bca5880406e7d2e0033f6d5fbd538948731da05fee8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB1917227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e49d176190bdffee3da4b481a8a2905719f7e9901b31c3a741e7ed9548d60c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB1917228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5431a5ed58e2bb39d330436be1e36e6ab028065ea40f1de6ae942d2982ba2e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB1917229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e746392e7544587c5850c0d11b9131a21ebef8f63f199a29291221b2e12d4b. 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/QZ5AB1917230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba815cbefc54a140a90d8e0385c14b153b464ae9662f9c2239402e70dd50f3f. 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/QZ5AB1917231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70dcb1a06e6591917fb96da5c5f5da9d92e599b1076e99b5a4d2b3c8a7a94441. 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/QZ5AB1917232.