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 0x8ef40fbf9978a88044eb9624a1247993a909ba4256e8d60daec23498f093d3c1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e702793-8ceb-4bb0-b094-a53fb1174f72.json and https://artists.proofprofile.net/proofs/artist/6e702793-8ceb-4bb0-b094-a53fb1174f72.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 0x2cd4e9355c97837fab6ecdc7b180d7f765832e9f70d6be0da83d02d7f26c67fd. 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/HUA251755404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616b1f8aa8fdccf8a223c611362a799ef3bbe50912cda123d6d4cdef8602b291. 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/HUA251755410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a4a53687537c3b15331600b0b938c78a9c8a72c9e234424495e16cb06c33bf. 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/HUA253779301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745547e51ce476adb0fbfc6a49f2a98c492cae566d29a3c399d19377dd1944c3. 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/HUA253779302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a5e9ceaef5c8e1dec0c12cac376590e173b75378bde70ec2e2a52b4dac5963. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/HUA253779303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c60eebc5019f22f710996bbc7150260ca46c9218fa93a43e5b823e9ecbb98f. 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/HUA253779304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0522d311a415da6e7c3ab19ede023754e1c66409dd3fe5a829c0cedcc2ed00df. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/HUA253779305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7645f67be92dce718e420d5184abe576578fda7ac8c9c150e1203eb06d46b1. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/HUA253779306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bb8b425e9ad8accc235468b609830710e07905b69c303e730a217438bcc514. 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/HUA253779307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a87c455bf87e51c4d83ea63853906276626ab8ab65f9e0fcc5be4e3ad87e91. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HUA253779308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97bdb54e798b1954bd774893918fc9d0e5262ab60cbf03e62c3b555c822e07e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HUA253779309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891ede5c15804a598d0e1161cadf88c59b89625a456d64cf05321cf18f797456. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/HUA253779310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f294259bba42dbd37de394ffaf204051e70e6ba744166819e62718ed5479284. 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/HUA253779311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacee7f2a3fd66a95b6800fae02483e9631a7c51a84cd869bc531ee92bbef0559. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/HUA253779312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa29bd1e519a5ef3bc84c837e91db8c6e598d21a687559d2d788b46fb3a9f2fb. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HUA253779313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf688b6a6a6535c34e304e4a26b62dcbff3d624a78f26fdc59a6a66fe48bb31e2. 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/HUA253779314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5972eacabd101cd5c40dd33be0283d9aca6f60877f111f48b885d0ae0300c80. 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/HUA253779315.