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 0xfe4e33b4dc86ec4a645bb461f03bfa2042b9bd09d445b434eef05f0df9937441. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b707611c-c601-4938-bece-dbe82c429cc6.json and https://artists.proofprofile.net/proofs/artist/b707611c-c601-4938-bece-dbe82c429cc6.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 0x974c69ea0fc068a80229e9f00dae9a01170ebc32ba0060fd53cd32ecfb117d40. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/BXZFL2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f94bb0e1ff6d5470002e3d62352236b4639744f04b97d815005031fe283db26. 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/BXZFL2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe7da2ed92892b403503a6ef3cb9c478c26525ba8aac4523757a643cbbd3efd. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXZFL2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adb6ed6d9b604606697176068271ff3e790b439eae151a879baf5bb23ac19fb. 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/BXZFL2100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65cdc204b720b68b6a3b539ae9ef2c44b0e0230453d9e816e1745cb0cbf7a120. 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/BXZFL2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cff60ac15b2dc4b83d0c43033cbe9684774c8eb83575163d0dd01079bee4dc. 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/BXZFL2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdebdf1e5fec39e1659644dc9878cc71e51fc5ccf258dc60ec6b029e7b10d9a0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXZFL2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b83e67402f8e999fc8910ae3f84f67504374db1fa52bb6b9a0279ad9ef2984c. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BXZFL2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e91cb57a555e349005067b2f8b863bf10eefcaaffc40d01654fb16cdf83be5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXZFL2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe330388a336701431ffba702f8625a0ae236c17d90fe47d27c6f800868ebdc8e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BXZFL2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6794c67722a1b3a623696fd29c0a0b0e4bd1cd4764c8f24874deeaa37d51f5db. 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/BXZFL2100079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa962405df58395b2338b3d9385daf177f81725fa6beb6f9c75ca574996220c68. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/BXZFL2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e683403d2d0c844206f0225d5fa270bcc5789a5c261206c1cefc425df63e797. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BXZFL2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974c69ea0fc068a80229e9f00dae9a01170ebc32ba0060fd53cd32ecfb117d40. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXZFL2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe941f254443574fff1a0b2c84eb8d776b536578f2d5535969a2f7466c8f978d6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BXZFL2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf331d7fb6b10ac51e49aa1ac1c22628300cdff9ad81f5b7895a4ae4844b392cd. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/BXYB52200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0301233271119e63038be35ec25b039b1b0ca5b7ece4bb00757f233ed6ae9953. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/UYM122200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bed4533bf207cc84a8e7f28f0973d3f392991e3a68bf270ea7e1ceb65a6487. 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/BR6FF2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b83e67402f8e999fc8910ae3f84f67504374db1fa52bb6b9a0279ad9ef2984c. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BXZFL2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8d3842b340513611a0332c4033c2b6c43e18754dfd68d096d886053883e458. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXRFY2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e683403d2d0c844206f0225d5fa270bcc5789a5c261206c1cefc425df63e797. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BXZFL2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ec783b1d7357ca3db105b73ae07b60b857c1cc30a7ff797ce4c7df1a85ed79. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BRTCD2000008.