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 0xa87385499d4d6380384159953c43c3df5db54dc3eec0869050c4e62e60dcfa96. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2f0697e-14da-4cae-8bec-7f575cc8baff.json and https://artists.proofprofile.net/proofs/artist/c2f0697e-14da-4cae-8bec-7f575cc8baff.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 0x86c8436b848cda1141ef357c6da043269741b95149bfbfae4fab9368e22d534d. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/DEWM91900209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a834b72b938f48d7ebc65db449aa098b4a3a8dab68d833b271122a808c241b. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DEWM91900208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f82c869bbc6c368cca49081353dd9c6bfabf7386b774f52a9565a9a08727045. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DEWM91900206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1c2ecd0ebdd52d194895b0db03616e14a3109859c9f6d1c593d4452003b2ba. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/DEWM91900205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f5086d39edc50619f6f98fae5b8cab0cb10878106bbd656b3126bca0b1b694. 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/DEWM91900207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dbf9dbc970e7b05722a57e4fd1f2ebcdc0e55da67bf88c4cab45aad8b2ac7f. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/DEWM91900211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf8b3251e2a3925cbd3aabf0b413204a6a22b02ff17b45d18458c77209aff99. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/DEWM91900216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd692b168afde3a77eb2f7cbf2e7ddffcff5843b826984eb151ca93556af7970. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/DEWM91900218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54007c790d8ce94383de6a8ca797588eb4827d6248a150423a061c1a9a59901b. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/DEWM91900213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9d52dd277f1450b08c6d043519452e8a0fb49dd84cbef229352c2dda44a20a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/DEWM91900217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dd1d52fd30872889cb56f76bd71274eed0b4b73b407b12a813de0dfb9994a5. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/DEWM91900219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8db235ce0f80aeaa36a43ae5fa97a1d2ad40b43316f4a00ae73b560d3496e1. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/DEWM91900221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe76e2a6be497e754d7ca9b26168e03437664d61a7348f45f6f68e2731ac333. 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/DEWM91900222.
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