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 0x15b1203758b973c035a48cb36db29dce80615e5ec181e158bb7327c628f6ed1b. 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/ef72c1e0-717b-47e5-8844-57b873041126.json and https://artists.proofprofile.net/proofs/artist/ef72c1e0-717b-47e5-8844-57b873041126.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 0x8b31b9f8bac5623a542802bda045d9c62b105c95cdb3c086c51f2bfb7ccb6a79. 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/PT0EJ1500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf2b7de4023a8aebe532a4625f30ef17e23e4a32ab5148e674b1e2c0219435a. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/PT0EJ1500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170748831663ef8513a93467f4d64870064853183f1d74965798fe4959e50748. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/PT0EJ1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ada54703c110c83bb9e0b7d6d3d533750268c0ec3252fa348e4bf41b512070. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/PT0EJ1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1597ccd44b17d0a2cbf98d074f0b0fa0481f6c6ab0b47346edc3ffd2f7d4f6. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/PT0EJ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b46ead7002e1508e030469567defc1f160a3d86316388f987862513f1ad129. 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/PT0EJ2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb0187caf44a2aced83619e69fb15e1e39e7aedda7528b104229cda6bb142ed. 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/PT0EJ2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1597ccd44b17d0a2cbf98d074f0b0fa0481f6c6ab0b47346edc3ffd2f7d4f6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PT0EJ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38fdd5b869617ecd9584d1feb20374f4c5ed3900b92bd2c6cbb67a902ad0ed0. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/PT0EJ2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b46ead7002e1508e030469567defc1f160a3d86316388f987862513f1ad129. 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/PT0EJ2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0f5e057e8d54d2f17e975d1eab40eb31bdcd483cfb7d5d2cd64f6d4fa2bc00. 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/PT0EJ2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb469059adb3dedc8b225b4bc4e8a61ed2ed7170873e73a7b844ac21ba9641fcb. 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/PT0EJ2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4112b8fdcc9c9d7bee4a542a47d4fb89068a7c52e18ae7eccf345a6f7afdd0c5. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/PT0EJ2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a28f85bd7eb66ea3a522a5bf2089c301cad74d17db6cd5bc9c776ef9dd7a50. 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/ES71G2024045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6a120d74460c1a86b8afd6fc2b7726cb8e997e59c3422b88b0e101bbe4269f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/UST8K1694113.