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 0xefcc69af5645664135a1b893e4b08e6404577f8db353b9b179062bf9e67370cb. 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/cc38dbf7-34a4-4f6d-a224-d0cbc9279a83.json and https://artists.proofprofile.net/proofs/artist/cc38dbf7-34a4-4f6d-a224-d0cbc9279a83.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 0x6cfaf04160c0e1c254a3ba6df535133401b9e7f6bda6a1f7f6f42d85ade20253. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZRP52304855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea0698a839d5f78954dc1e3b4c414fdb479ca61232ce3e0a1b9d92c9a50b527. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZRP52304856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f58105cccd36dede56548c5b31969032bc67a09648b24659a00d2cc161b98f. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZRP52304857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd413321c2aac44c704b70f14b8dd87f8759c99d71fadd72ebccbb81ab29302a. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:41:35Z), 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/QZRP52304859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e3a5f8247fca3477cb4b9f2881343480916dc71bd03aa11c19cc1f0ec921ce. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTB92420060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ebba42d8c00a269e76a07a6b4e618f55846e99772f4fd21f8dfe443e5bb9b4. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:05:15Z), 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/QZWFJ2497153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efbdc8a91977c3c01a479d2bbbd1f05ff0cfd8a4864f8bf31f04925c34c79cd. 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/TCAIF2494409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8e08cc0c7de2893f31c4475ef46118ff78ac26ea1656ca4f0d62d30262b5a2. 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/DGA082338187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8be8f3597e95830a3dd818177047e6557798006b8a811049f98517699f7a501. 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/DGA082338188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa555987933bc5e7fbfaa3008b76690d28f48e4f10cde73f22dd4405855fe81d2. 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/FR59R2209271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea516183fb1ccf2e5c586c366e98f16fe0f9e985073da2ac4abd6406648cf2f. 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/QZDA52441250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcee915a6a40f9ccd0bdba78bd0689d2b059d3d829bfbd1c6b095ba574429b1e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZDA42127284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9255482d7fc2207f7e683996154441ac411709079e4b1647089047befcaa12. 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/DGA052221838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304978bcc8237e68918cc751785d81f9b7443b8bcdd409c1e7ec5f39bfa394c6. 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/DGA052221839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7331809c9f1fff3da1da7e6f6128684f305b2b6f7a9ace55082acef02ea01c9c. 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/DGA052221840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491b8d9b40d31020c9fec829226f5a64be9989f249e3d4cb1a358164020e41a6. 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/DGA052221841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1520ff767fd440d9625507120305acd6dd05321954b46fbe190e03c33a570912. 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/DGA052221842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb508b44341897e059ee22d7f786709412f8c378d485d71d5df3cd0fede1607. 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/DGA052221843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e1c65359e6105ad1150597a9b88c2728573e8ea4b4e6a3bfd1b2d664f2e84f. 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/DGA052221844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf2684a27729d050496b1a70d28c627a43b8cd95ab63f0bd91f805e1bb036a3. 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/DGA052221845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba9a08460797c1edd2d8975859fdea1fcdc7507041da361743d4ebc5dca2d76. 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/DGA052221847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1247b5a546ad3da506e5c298bdfc32d66d649e405500fcbf32a45fb75bea38b9. 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/QZFZ62419644.