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 0x270a321dd1a37454dddd0598ebe021e6147cc9b1c826030f878842e1667e9d51. 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/86589316-bce0-4ce2-8b6c-cf6c0ce0a18a.json and https://artists.proofprofile.net/proofs/artist/86589316-bce0-4ce2-8b6c-cf6c0ce0a18a.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 0xfc20fe5305d9c22c4d426cba8b1e10ed19b1e4069a381ba63edf9e33934aef49. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:17:31Z), 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/QZK6N2469817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc683e9b58facd114c77af758bd0c7a76e8a8fcf1477eec9c53c1a4170e65279. 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/QZK6N2469819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec2660c1cedf6efd3ca02e7a99caacbe8d44b9087a081ac16123db4097be6d4. 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/QZK6N2469821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bde1ac376d27c831d0d17ef3e53c954d6a63bf2ee50fb93760810adffaa30d4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRR642400749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186c28222ff8ded3da0ff5198b2da684f23b9a53e9f74145e561802becb2ef51. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ32325078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1affccf33a77da68f1565407f14b405eb62a14d34cfd4cc7d770d5a617958e21. 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/QZTAT2209805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f0696bcc9ad5339edc105abd105e69b35a01cfb2b80b6406205fb20def7f90. 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/QZHN52203776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803507f594c620df4e6c87ccf91b0f1a6cfe9dad1616766bac0d8d38dc056156. 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/QZFZ22556817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a50a579c2ae72c5986b390b0d71c4c808672c47b859f2a7dfce602d4c5a7c1. 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/QZWFP2480636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c24e2d4f4c7f75df6f9d33b4008b3623155aee171dfb416c4f1be1435ad55f. 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/QZTBF2402999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746e166488d4afc61c6fd9934e3cddd0298323d91379db6ce451d7f02466de99. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZTAU2231425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cf95ea2024876586a57361b1c35fcd82c1843e3c2f4b2c4552feead6ba402b. 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/QZTAU2231426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee8f1a2581afcc03d351a8ed45feda616de191f924dac2ecc682341aa5c5609. 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/QZMEN2211868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b065827256b4bce2b5fd7af79087ac80f81dbbf1abe4046fe2e111919ab0f5. 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/QZHNC2429094.