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 0x0393a061bbe77d27f74bc056256aa59af9dfb3f436eee954f7bda72095a97f56. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62e198a7-9f89-4480-9ac6-cc44a469d3be.json and https://artists.proofprofile.net/proofs/artist/62e198a7-9f89-4480-9ac6-cc44a469d3be.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 0x8f3a1c5ad1fe6c6ef90cf97d7b76fd5bbe43ae9b4fd5b3dbcf7f6a0c2db2dd01. 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/ARA490800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209f39897442957b828faf66a8b787623dffbfcf9ea7f2fbd9a81c8eb8bcdb3f. 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/ARA490800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cb83bf2eabe499e2a8511dcd72d82a56e998e1106f13bc1e0c22d2ff268216. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ARA490800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bf39789c74e16a9924d7499b81f49e02c10c3adb199e8f11e95a3147efc4e1. 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/ARA490800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9341436156615ec5097902500c031314d99ee6736b32854eed9d9dee78bcd26. 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/ARA490800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f12abcad40b5b992933c14cffe202cf081d0fac320bced6fc5817a750ce678. 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/ARA490800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb89e02290a0be7a63e0d726a355a6e7fd9f3cf2960f11fa2c473ce712386201. 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/ARA490800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468adb36a96b84d0c45f3216d8ff715bddcf7b8925caadc23b9ad9a9cbd34ebc. 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/ARA490800035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbb5c7e28ffd25e88ca3e1b34886ccf09b40a77bdd054acc59324f3d9f179c8. 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/ARA492100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f756bda499efeec67697875e47f82ee4a96252c7b042eeb98a9338453336c8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ARA492100043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3daac3de2e954d0a17dbbb13c678c6102151e198e15967c2f7bb50ccaaf340. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ARA492100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170bff88da4f44860bd96d18f3e440ce9fbdb29d3568b54c962eb7bdfce70677. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USDHM1317000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0994213be9f4fc9e3b872c0abdcf2e77db15214437a013cd70f6c1ff57daaa0d. 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/ARF861800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7c4f1c7d706a531ef2064b4b602f8f8804d70d88dcd459c2ed80f5bca16eec. 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/ARF861800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902e4d00bca068d539ac5b912f0aaccc7be76d4245f0822e7dd6590b7fe8f1e9. 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/ARF861700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42802037d65fec84fee103051f32185261d90274c7e7225ca05f9b0d1a3d8c9. 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/ARF861500098.