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 0x1975ad910e43f1a59fdcb093eca295cc245ef4d4f5133938304ecbf59c8aecf3. 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/a6f3b990-b9c6-4b57-88e9-81e0d1297e6c.json and https://artists.proofprofile.net/proofs/artist/a6f3b990-b9c6-4b57-88e9-81e0d1297e6c.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 0x8cafbce16c3738e83a5d5b729dd753bcb5144b3e9b2a4cf7961a8ed0a1c0126a. 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/HKG732272769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4126b2901c70b21b646360a68439382bbe89203622a08d57d36a39303bf23d. 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/HKG732272771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99822dd18a3d7f5aaca87efb9b3a1b4df93873656a877390be67d80e5c67fe25. 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/ESA012402337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0ba2af364d822ce8d0c32e1de6a30fcb27dc184448fffaa07dea115ba74af5. 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/ESA012402338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f0387b2e82740efc3c1f1453212e398a611ca7a99c8fab614ed40c93c9d48f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ESA012402339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe789614f8bc3e1fed5f2d9ce1427a058d5310acae8fa512b9ec0dc069d5e86c8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ESA012402340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7f19c184a2173c43f12629fee0f16c92f39b21cf18d1a5d787589553310e6d. 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/CNZ632301241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bd1b869b9d5c52b5cf6d043a82e02f2cf812c9df3e14e44f5229e618435a0f. 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/CNZ632301018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6593f9301bbe9a9f2c6e1e77c0d9f4764978209653038b720111aeb3a814a971. 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/HKA412300353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ff20c8182ade49431705c4e6e0e5e763dfe4bc4589b9a6745211d91c6b92c3. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZZ972372925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68566c5ed7389f4d614a6b7ece36a8cd1770937eaff4d92347ab01ccf69b7baa. 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/CNZ632300512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35c147db362fc91c39190f7edaf0b47d4238c9cabd1073a5f1ff55ed65687ff. 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/CNZ632300249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcb9c632e997162a369cacc2297f7adcae2a1702f1842f2a07e1cd59d4fb6ba. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZZ972373261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd4619ed61ded1d95adb8914cc121130004a6b7b893a248eb15e298e23ec347. 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/QZZ972478972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21447d132a816bafc027cfea7eb39c9567709b47e9997677c1ed0cee1eb32c7b. 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/CNZ632301134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463d9b7cd4c03f38fed7d751300c4569adeb2bcb269b07c6bc2edc4cff6ce560. 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/CNZ632301130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192e0c035bb62cf9dc39931e030131afa3cd3aa6653e208b1a6515564519946d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QNSM12400892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c7376118c667498c26765b9a4a2edb6f0e59996144c4c118f9f373084caf5a. 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/QNSM12400842.