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 0xeb710d9096871cc475af9c81418ea48ab743543e372e93d4fa25a6f6607e2cbe. 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/e3950ca2-3ae4-4394-9cfc-b0c29a8674a6.json and https://artists.proofprofile.net/proofs/artist/e3950ca2-3ae4-4394-9cfc-b0c29a8674a6.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 0x42647cd7069cfcfee464460c542c482809c7a2d3423162cf2b06d4f8d04fa102. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLC062390018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f028fb42c7de8be75f44ff256c0855d9e3263a2a6ee0f2167282becfa11c22. 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/PLC062433949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423e27999795841cd658b9d4e6322048c2121e592c51a873f70b1b0c76a257d2. 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/PLC062427777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63725542d17ce89da7cee396f01c49ccd528fc4baa1259acecef33193179cb19. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLC062396018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1f9cf748a1ae32af8b7698a41197d35ec945606d0b739d9efebf34f380e80d. 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/PLC062390119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e3472bc835766f110a0ec941311fd782a03882eb2b2f38b78ca34702684fc2. 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/PLC062389725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cca1487431b53368e725e9e69afa30d84632e041357a0644deebbd3bb17450. 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/PLC062388536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46652f31245c0bc82e7718ea10db0de88da63d5456c7deee166dd722de6b3e7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/PLC062386889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806a7cfe4625110ffdd523879f21e04088daf5bdec3a682bb732c34f4c4210c1. 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/PLC062414782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e0d2c620ea0b561d40f42e0cab4045c973d0b20b918efefee74fa2df1781e5. 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/PLC062414783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb43f82d16f5e1079e8d0c929016cfd3957b3573b86cfd76cc701ed2b19720b2. 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/PLC062414784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a555da91261979d3ed399908a27fca8a812eeb8b4aab08c5142c5140bb777a7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/PLC062402036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63725542d17ce89da7cee396f01c49ccd528fc4baa1259acecef33193179cb19. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLC062396018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e3472bc835766f110a0ec941311fd782a03882eb2b2f38b78ca34702684fc2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLC062389725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cca1487431b53368e725e9e69afa30d84632e041357a0644deebbd3bb17450. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLC062388536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42647cd7069cfcfee464460c542c482809c7a2d3423162cf2b06d4f8d04fa102. 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/PLC062390018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa798582bacec58f44fea3778cae0c9bad2abc20ba95d808c3c5a439d0a55960b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLC062396648.