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 0xffbea70cac67ac3429cf1eb4cf3b2f2b4de566733c46d2f33af2c453eb78592b. 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/03db45fe-09e3-4bf7-82f8-b9a919be4db9.json and https://artists.proofprofile.net/proofs/artist/03db45fe-09e3-4bf7-82f8-b9a919be4db9.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 0xf37c4a978102168203a97b6aa528616920eafafb4de5052a44cb1e2cad140bc9. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/PEDJ10516502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892ad0e2e7e0c8e82c184947aa79cbe554cf6376d6a6ac3a039cbccf253a5951. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PEDJ10516505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81b45aab00eb3024483e9d90a5b8472e3d86b7c047c39ddd32b85bf766254b2. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/PEDJ10516506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5986fdd3b898a65736df3965772d76bffa878a18a3ad3041d179578ea7fb89. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/PEDJ10516512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f5d543a844dee82706700d74af475c0441ce05923c6de3fda005ad20d1e467. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US6R21397069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4e15bb459c8100a584fab2388628bd999ebaf77ce78d5a4ff25df9538e9efd. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US6R21397071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb30fa08b533824f4402d454c1052587cd13dbbb92d4e5caa318db2b022dfe4. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/US6R21397074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ded173516a8902391ce3b8595deebab14ddc136292c066ee14ddfbf5a2ab58e. 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/FR96X1682037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ee8fa75d66d1ac677c01f88d66921fb8a748ac9a87e3ddc805f8354ba137df. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USHM91919971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a23ff76528fdadc69b188a641733f9e436b5741db32087671c48d4ccb67b92a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM91919973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d98ae3b29592b26151452d83c81906bcbbbfad37f1df1ea017549498951ede. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USHM91919975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187a4ddad3f18a4c045826417728c25f9667dc5cc51ab5812412258a4acf891c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USHM91919976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf672c1b20efee0d9c3a70429dbee769f27a4e43181cda71e13cafc66ecbad26e. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/USHM91919970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889908cd84d45c07e9ad67c9aeedf758b6e4d1274b8f55b98b040c66c41cd115. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNJW2252034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacbe4b4ae70493dc3e9dc7480af86a27f2d41b2e140f7cf182470bcadb64daf. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZZ7T2435843.