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 0x89b3582cc0c6aa2fd79ca0dff570ac855272a0d46fa6ce9934efa7829abe0eca. 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/4c9265f8-1ce5-4af8-8d27-131ad8a6a6c3.json and https://artists.proofprofile.net/proofs/artist/4c9265f8-1ce5-4af8-8d27-131ad8a6a6c3.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 0xac17a5e83d61cb64684b6205edd272bbc51afc2042a859f5d4c8d58054b5dc5a. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USUM72305793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e65e7af555d33cfd14b56a3636dfcb9fdd273cf1e275a838895dc21d24844c6. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USUM72305783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971eb0cbc845e6058e0b23315bacc1a799124e7862437023ec8ed63f6a522d1d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USUM72305780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24e94fbda723409146a9ee9a35be7e11cdb3d6b008cf69a1caef47b789e2013. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/USUM72305781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f10eb0e2bc7af52e007b5ab256fb66959feea8f887ec82bb3f65030a01ec08a. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USUM72305788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef32d56613e0c2e95a86baf0a1c02537436db32bf7063ccdba0752e437d960d. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/USUM72305792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc175bcff22c76548ed2dde143ae0169e26006988d9a7fbda73b7cf28aec15ae6. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USUM72305785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe70b519bc94849b7027e24eda143f908d8ad7bfe14c62c9841e667b98e7ae1. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USUM72305790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d5c75856a8a4a34ca7b661733242923c36acebb67537b31cd89abdb5b24571. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USUM72305784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3f623c4b7f66271a7bb2518f578bc8da3441259399949707664021b893da34. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USUM72305786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d22f539de5dad5c4aac6cb8c842cbb722e27791e56972b75492505b5c528d3. 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/USUM72305789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eafb5c3d60c57787223f0422baad016eed9c80ca8dc842eac3e8a403adc5e05. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USUM72311469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40955b9d634728a8314deaf06c9ea899ea7db0de4debfe992b476886b77071d0. 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/USUM72316169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a58352905cefd8c7daa29ecd1f752bbd07c15372239a8ea033b52ad133d215e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USUM72405470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65978cb9d721d8d2d92be67ae6786f4332a645d3de3ce5708440ba322a8ad7b4. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USUM72405475.