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 0x0d22e618d0b2cc0f1c34a6c067ab14910ee6a01c5c4947741e317c4133624511. 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/a32437d9-6eae-41fa-9a6a-dc6146a764f8.json and https://artists.proofprofile.net/proofs/artist/a32437d9-6eae-41fa-9a6a-dc6146a764f8.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 0x11ba645e32998c384a8830ae713bd0d9fb33a6446b46e481ed3ccd514fcc74c5. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZNWS2564725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63db01c3c5e2c9ce0360a718559cb2186f8483bd2867346eef5494bcd067fab. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWS2564726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687f5c4ca1516d97f11a80283a9f1c94488a101d6b7caa6350730e5e9d2b4754. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZNWS2564727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33479372e0b386c218097ef86cec59db3690e0ef0f6cd875bc014d72715f174. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZTAX2520046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf73ade5a66dd9b21ca20b52745fe524121f0b274af69077a09439116f6f89f. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTAX2520053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc08f79836cbf10ce53a7c4d2a17f0032a06ec5acecec5a7d3d267eebb91940. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZZ7U2541935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98e2f87c02c72432ad46974d5440a68a0ffce01d0b39f1e8fde90097ce7d7d4. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZZ7U2541936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccdefc1287ca3f447e9fffac7ae99c255cdca951075ffe34c7d0624a52d9cc6. 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/QZZ7U2541937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc070efb7844f31bebbed8210a50688041fa0f2b80e00f45d91b7b2c94e2abeaa. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ7U2541938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82126605917506e61d9885e6733e23889b76dfd302f81419429c8230524bcf2. 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/QZZ7U2541939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cbf11118c11a77b8058cbe43dd6109135b15e619292f36e9b25ffe72a61f8a. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZZ7U2541940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93bb02f5ee7c1c61a30610d72f749f3eb8f72f7bb9f27c7374aa8b5a60ab5c45. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZZ7U2541941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c79fca636a8dc4ea9f814a767e3237f6ed1d505e1bb1c6159b482e7085c5fd9. 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/QZZ7U2541942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2106820c398b31a1d9b0d0e7050080f1826b08f5ef8879e22f4f6e31fbd6921. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7U2541943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e6ee6ddc7e51dbbc0336e57bfc3b6d610219a37ffb61907880db1b9acf3feb. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZZ7U2541944.