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 0x24b1f5bf5814578cfe81c2ff634a04a98ec88271cc348a720ee91f2f07438d1c. 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/5d88874b-4dd7-4002-8e21-21fed0566d0c.json and https://artists.proofprofile.net/proofs/artist/5d88874b-4dd7-4002-8e21-21fed0566d0c.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 0x3c808a4241e4fa1a1b670ff2f5245d994720484ac6e60e2df54f83affc5a7346. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USWZM2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba18cec9084bf2ee2f304a4c9fc99c20ec7d35eb00a4d8ef4616e7c96c4f7c70. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USWZM2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b55b608dfa2654c825daa1320667e9c381e07110929a1b6cf1a4412b79aa9a. 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/USWZM2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe0a376fcdfe21b6ddd318cd489b01d4d9879ac146376ef5af077ace9306192. 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/USWZM2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe405f01ea3077bbc88f5986b0824e9a17a1fd39442a65d7cdf08d3c25fa320df. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USWZM2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e3f14ef1667d65b4036b30521567e3275429557d941df0f7873011ae8a2589. 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/USWZM2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc236ec721988e3d7751104c9cc1dc1c5212de42279008a886d101cb7fc91c6. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USWZM2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab27bee9b1890cbc9d7f6602c1fcdfcb915ca2987dd756728ae040931725ee13. 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/USWZM2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf084d57099f0b36630750fa5c5347248daaafbb4c10535247463dbfef03ce2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USWZM2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5b2217b61f7884894802dbc0761d0b03afca011babfb1772f558206570da0f. 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/USWZM2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb650f2d027e348ae22cc861d4eaac60aada4e7ad52850271c1a068a46fec2d9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USWZM2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244cb7ea51d7a13c263883a76ba9631eadc9570a7410a6e0c2d9f72e462a8244. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USWZM2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eddbbcff2aefe0f75f6f6c51b8707d7188140f4fed6cdd10c93b6041a8768c4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USWZM2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fb0c42af526567e53d2e3750fa897ba32389b0ae17f8eb7bbd18f2a5535663. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USWZM2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4f2c34e130bd05d855135255f2883d02a195152c6de28aac50ca7de9f67157. 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/USWZM2000008.