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 0xf8eb4b9742e8f91470ff74a12f88d8339295194bcf72898c84856f4929fb9c86. 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/73bfec55-f95f-4306-a6aa-7bb3548cfe7e.json and https://artists.proofprofile.net/proofs/artist/73bfec55-f95f-4306-a6aa-7bb3548cfe7e.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 0xeabb246da8ea16541fbf53be155b61e2cc5ddb85d4e26dabbce5069bd468c447. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZVEM1865332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941a68ec01e0de0b79c9ceaf84d829edb88f8361fce9e149dfd6a8696b2d87ac. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZVEM1864998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869aa1c4e375e31df84a595ee4f67811208f62b1f8d3a588a7837282c592a20a. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZVEM1865008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff1ed88f90e16723c3f7ea529482b0c6bbcd7bb15f9d039b57b8467a62fde50. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZVEM1865009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafe1af06a93c8ffa1e8bfeebd3d9b177f6354194781f571cb39e527d15556e4. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZVEM1868800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692a3cdef8fbed274db36c64519441ea99e6a3e32867bdad88ea98b37e33b665. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZVEM1868799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55d9a44d54f045660956bfbc884e55c7f48cb4f995aa14a31a2bd21c51472a0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZVEM1868801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51a8a82241fba95ada6efd9da38e05a9f852f3b7afb4854192e100ef37af2f2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZVEM1868802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca131c8bb5d646153c5e444a63ce8cfb2ff76c712b7f0ed0f438917d462685a6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZVEM1868803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645ce25658776d0906116cc8fa4f45e690529d0c1303582acf3f7b4425d7732c. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZVEM1891605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190e767df67db9d4dc389c67dca3750b851c1ed0221cc5ab925cb71b99964d57. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZVEM1891603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa750d67de21d518e396ef6e486340b3618846a6c5ed43c1afa26871a4cf0e149. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZVEM1891602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd007133aa983d229d0d0205c7fe8377dea050a5915bb2d43399a4fff9a4a919. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZVEM1891601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d004d902e5cf6eb3d1bfaa867a04a5fbcd3e4dbb89a97b7909246654d870e2. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZVEM1891600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa622acb1b933360fa2955b00066d467bb77eb3c5fb71a87637228ca6df2b5ab. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZVEM1891604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdf1de564143d511ad3071c5987f9249ec24ae4d109db97be87a56574aaef78. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZVEM1891599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640416c5e4e54e8ff05ffe38e8be07ec98d63979a5c1d2d925685c77f8a00ecd. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZVEM1891598.