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 0x4e1f58f5369fdec90587484f7c841bd03ce93ebdd2d12f29ff0ca74e4f267031. 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/f6a12db8-4358-46b8-9c65-414b8196f8bc.json and https://artists.proofprofile.net/proofs/artist/f6a12db8-4358-46b8-9c65-414b8196f8bc.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 0x97c91df5747574df48bc83e94bb9f994e38763caa089e48ca1667b4a81f97cc1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZJG52035019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa967268fda4969abf383ac88d2782154e19beebcdd52223000c4b59145459948. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZ85M2028119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec2b6449cd9878e58296de12bcc7c17bb159b4f4c21bf048120e927fc6c73a6. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QMGR32002086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99cab422a6a76f046c1ecf5dd8de2ae3860d539aac9ab0d0c2e990523bead5b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMGR32073619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806042c780f85e84739df7d309ef859c561bdb97de16a6f737ce68291c78a84e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QMGR32137695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ead7a3821183241a334a9e56e7e45c4dd73bdcb3df172bf68fe5587638512a7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMGR32137568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7272bca837bc401df19ec0ffa0529e0ecdcc16dc08bcdc90b1388a63ad5cb07. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QMGR32168113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f7a806d5453afe1903cb59b819c72136fa2430592c5f009cc93a904ca3b396. 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/QMGR32236704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cdb6bf77ce38c6a9edaec7bafa7250d359ccd9bc6f5825551ca508353c31c1. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMGR32210798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd5a1e0668b7968824054e9981f0ef5cc65840e51a38ea66c38783859cf8e51. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QMGR32210789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec994c3aab74887bb0473ca41d121562bcbdf3205eada9fc9c9fd652b7bd22de. 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/QMGR32236485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc7b7a8a2075c1b7e665b8b5c72ecdb5650a8b9fe31b3618bb3d1c5eba8d930. 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/QMGR32281357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa050c644e9180e05a30ec8818b6babac8dd717d8b31a4c9e23312b2ed80b7f09. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DGA0Q2380128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b9b7c994af7da189e428414f1b99b78aae32343ece2aabe684af2e3aab92a6. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/DGA0R2339318.