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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 0xa7ecc288d856a491ff7e209064f7177391afd905081769a60fb05bba7a1f8d74. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f337308-7d66-412c-b1a5-263ed07e925d.json and https://artists.proofprofile.net/proofs/artist/8f337308-7d66-412c-b1a5-263ed07e925d.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 0x73525a5a93a458184376e6d2c3c471fe40d5b0ed737c8baf3b3cb3e35bd80a4c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USMBR1712364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea42cbca68beb84e3b30b389319b2f8d6600a716d9103371857d71e92598d3e9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USMBR1712365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8897f4891e8f14a29417403cd144ce7a1062d778b5a662c840d0a9156dda28a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USMBR1712366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f81f0447136a5723869c06cd6e503b44257447bd458a40a2bdaaed1a2ecb9c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USMBR1712367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b11760e737e48130935c89504bf25c4ef6c9370dbfd5d89f9d7ab3d34e522f. 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/USMBR1712368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d1ac9d9a285db1c31578eb9f9aea96e6551c3312b2ec03ece5873f5c1b272c. 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/USMBR1712369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39473cb16f9eeab63e47054be1a878b174784f067d6a30cd06d6cbce5b1f2d32. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USMBR1712370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da9d0767d07e094d2a53a6383080facfd924287c724679654fdc6808f87ae58. 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/USMBR1712371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0029be1446a942c31149c696a646a62d654720b9fdff6c907831b8bd971ddfde. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USMBR1310385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b37f9fd8f6c0faf7e42de4d624e63a5a7c503b05124000ab0ccd842388a1dd0. 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/USMBR1310386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c6b3092ec2fe4b4cc77a2bb4298b0ee0802e275d6a6b94583e189d4c431a85. 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/USMBR1310387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1157b9a1735f7b4c7bf7dd5311f526edb8d9e769de250c41f144c39dfbc06d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USMBR1310388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcd534273256a1b59204efc87c9666e566b0141a4852c41e61f399e6d8653ed. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USMBR1310389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f78fc028894f13a4b684b7afe71009cb7a49af334602dcbbd925418c36adc2. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USMBR1310390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3317581a39c18a139077dd602e3b6992594dcf73d3c6df41cbd5e9b9da5cfe. 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/USMBR1310391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367e8a6114b9dde62b6b59049a7ac86b72ef314f37b186193e6a7c3bfdd11b7f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USMBR1310392.