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 0x2c6fc0555a4aac5c4f5728b8e5bc5941a8554257ed512c5824a77b7a35721b93. 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/bd4aaefc-4559-4a80-a9b6-1fc35c9f366f.json and https://artists.proofprofile.net/proofs/artist/bd4aaefc-4559-4a80-a9b6-1fc35c9f366f.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 0x1c14c41e11dcdd6ec0a820f6d3806d79d985a974900d00495621ee5cfb62fd1a. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZNMV2011530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc72b3942911c6d2d08ffd6b488532023ed0461f2b5cfe9212a3f9de7e44eb96. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZNMV2011533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba35b1121f646160f8d1baa3ade314cfe8b76d5ce8454fc3e3b8db227cc8fdc. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:58:57Z), 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/QZPLR2161858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d81d70fda95c0739e99ff38219428562bebf14c9a5d3dbdec3945afc3d6211. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZPLR2161869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc603417332ba8383c04f567da67640aed364dcc9bb3c5d29787e681a7c9d8b71. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZMEV2260723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaeb6d70afee0768fba96cf3de3fa9b7ea31dfa53374272fa896275c8fad2b39. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZRP52388666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13dd716ac3b6989699cd9b03d35c16f29b2b317113fe903428c274a94e9022d. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZRP52388668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac240c7c9ef91d01356550d1550689e5ef0277400950a6c063a7f1a83097283a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTB82428066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad1f823cd6d0f5e0becec9295583d2bf9e37a878ed7ff1d0bfe3068ef0c9acc. 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/QZTB82428069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b823ccad33c7f0aaf78b73262374f8b87ca36e9afd25310f32933f962160582. 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/QZTB82428071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a0ef0829dc49807f9633bb7dfc261e47eb80fb55dbd05b934f51db23c5ce45. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB82428073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dd6640a9fc850981eb17f81afae3e596799e93a8c273b537b4cd41757ed39e. 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/QZTB82428075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2042feebd12d7bc75865ef6784e8f8bd3112c5859042b652600cc4a158382262. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6G2518042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad37403c633b8675f85eeffad1832c978c7dc66d23eeb496dd0e743669d0d7a. 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/QZNWT2306694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfbc44b5a8063d7057035b4b7fcb3d806c3e4da09a2e47f43dddf67154e7b12. 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/AUMEV2363080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a075f1b7fda2c97013b4d2a9681c49f8b6d4f287a5fd7d551c91abddc99b98. 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/AUMEV2307444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88d1f4cecafd22ecc63ea5c07efbbea78f687a484ab120b07d33b7d432d1eda. 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/QZHN32264069.