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 0x18cc8c87f78eb9509b039d7c4806fae9659f0cb851111b26b8975fa7ee69ebb3. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37d51104-5582-4df9-bbd4-a61b831ddfb8.json and https://artists.proofprofile.net/proofs/artist/37d51104-5582-4df9-bbd4-a61b831ddfb8.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 0x3ed4fb0222617e7519b6216ffaccadbeee45ee8176f39e38418844841c124d9c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US7VG1477163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335871581751bb16caf100df7ad5515a3f3883f7f3519c4760fc0cb93325be66. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZEQU1920642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eec72885e0043fdade9057c8619391f570b5b8294fa82a6787f14164d646cef. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZEQU2044537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90155c31b0f54e0ada3af3f8f4c25b46745fd5880b400d030d39a89194491a76. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZEQU2044640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840d4790dd94629fdf04361dac77bcf9ac9766efb31e667d3f56865ec2d62e1d. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZEQU2044996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a16d85885a41f2dced118cc13039132a1933666aa31dbe4ffcab20297694925. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZEQU2045011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4af8dea53db36b78c07dff9eae006a8e798392988ddc65f99c53545d534ad83. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJX2193094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e4d740baa35f902567f78fe733e7fe8b8b04997828459a85e71f1dd4db33a0. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZTVM2347111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c2510432e8377bc1572b3e7f1121bf6e8f910a84c335bc4648d83c78d3e1b3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/BCA2A2300374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dffb71ecbab64c75306fc064f9f65c546a54613399f83b3debe2abea936a46. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/ES43F2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0b0ce52997a1e468f55d1778fdfac23e262e2dad59f18de3a7860ab5178724. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BX4IU2417349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cdc4dae63de7205f3fc410d327259b26ff898e6a51d47a542b9c21d316c39a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES43F2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d8683f8eec85383973720b59b380307fffe60119ed9d0c27a778d4ff133edf. 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/BRXGL1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820478e8e69d6cef0a4a8768faa5ba1dbea29b80b66b698e49e72d5621151e60. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/BCA2A2400098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3540d47d8524bab1ddf394141e5d66f1b72c5829731968433dce49e95275fa7. 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/US7VG1547146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78edd546b6c750d41815f5d152b74be7695abd3b825f4c3899c5e4d18e29070b. 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/US7VG1547148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64228a0fa81cad88c5d48b77c8edad8a0f28d43be0b15ae5ad890709062ea0e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BRLRE1000065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04b4d72881fac5153a88ea4ae5a6710bfe4a2a379f8d5edc17ee39916068c22. 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/BXG6R2400627.