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 0x3a89d3c8e3ba0bba67c3aff468ce6ea406478d113e3b173296b8187ed4f0cafe. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e3dc512-c77b-44c9-8074-0b2a3ea3e6a4.json and https://artists.proofprofile.net/proofs/artist/3e3dc512-c77b-44c9-8074-0b2a3ea3e6a4.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 0x25a925023c9c7b9c051ac2558eb479bcaa109c64817465e06d68d068d16b0770. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEZ651335642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ce188f41c4c13e9622e73105873418582fb263e8876c4e14480e9872fe3799. 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/DEZ651354111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967ceb754cb33bcdd12d6f2550dcb63a6cf086123460e90fb5a063142d992218. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEZ651354112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c2d7ca4f5433f318afc0a0f533313aa3a5565bb3ca0a9d20c9c0bb405f87d9. 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/DEZ651354113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8b37e0d379497447b96c8809f453ab44d40f2db25cf23a6ece838b7aee4916. 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/DEZ651354115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cb811a454b42a4b213f28da86f4f42f74475172a9f7bdf7fbeed1ab640f064. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEZ651354116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e6ed218a68d2f4990fdd8aece5782690e82920017a5c90f78168ab8621cd08. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DEZ651354117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefee428f6001ae94faa4b9a47dcf0ce287c6b3e245a5207b0c16f5df35d8444a. 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/DEZ651354118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa136a44a2daea48184c8dee2adeb8df8d6b63dc22a09ceaadbb4189e10721c6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEZ651354119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784dbf6a324fe19e848f839806986431b91405a0463bff6dfc4de5a296f9424b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEZ651354120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fad038f14793910356f8d0a1ceb451c0d3cec27948f9213425b0fb0d0e8440. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DEZ651354121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ca6a917c5f134a330843192394fa5574877ade25a697a484044463d3b45583. 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/DEZ651354122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dffa4e575bb426d174fbf50922e8c8b8cc9f648c68d78b6fe82acc1af754e6a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEZ651354123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15b127a1d870196e3e8288719b9977e3b647e073a499e23d58802c5283de3ab. 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/DEZ651354125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1030234bf960b798507d2fd66fcb15737a0ce15317ebe0b4368686d61a6a7a. 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/DEZ651354128.