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 0xe1a42eaab3ccadec7833725d3a8d8ee0f22e22c2b0e8bfab7088bcb5d92cae37. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76aefaa4-b59b-4666-be09-ff2fc2cec9bb.json and https://artists.proofprofile.net/proofs/artist/76aefaa4-b59b-4666-be09-ff2fc2cec9bb.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 0x86af0037c184e739bf9e89cb5baa4b582c2770757e3e3370317635dd8c21408a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZHNB2380157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaeb7a1fc6cdf3db3c2c4fcd49c6715a5fcb98978404cec1d627dfa04a7c6fad. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHNB2380158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c78c667f0457b952938f1b05d0cc11c750ecaf72548ad2d28caaaf2a0b73a26. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHNB2380159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe997dff4d552fc528f30245e0f3f83d1ffac2cea9396987442a575378e5dbea. 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/QZHNB2380160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b73ad4a749dc2d59ac25d4d463d948d79e8d593357b27acb4ef40172d3e357. 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/QZHNB2380161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4a39b45abc924e3142dcea828dc30e0f68b9732df625a43f3513cfb2cd7d21. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZHNB2380162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa13c70008af6c3cae6b444b45c31f9446b25ee7735c201eac44376167ac5e92. 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/QZHNB2380163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf2fc5259b87cb9772961d937eeb8f393d3b1dd8e7cf7ead2cd1d4b0ce05e93. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHNB2380164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe445cb994fd9d5e586ca732bb2c301968afff00b81b186275d6d2e4424d5b4b8. 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/QZHNB2380165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9757f794579d88a776f76f5e5274790e111ee62eec1ccf6ab431f79b51c4032. 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/QZHNB2380166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b60164e0f3ab418485ab2d1ca893c8eb286ec6721078c18b9157b8ea54e11f5. 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/QZHNB2380167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f68b9c8df5104c2c52b73707fe51e1d4f003d2a7f931c0ad9aa18509b5f18ab. 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/QZHNB2380168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d205eb6fed5bd857a5e395eca8f65e3b521e4c54723cec51d14f7849d5e88ea. 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/QZDA52334386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72466a9b3810dd20d3975c6ece58c87e6f59ed62fa91cd87eb9b90e854a07d55. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZTB62228540.