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 0x5a683d59e45b7b4b803f71a3e30f5f24cd585559be60742b014440bc3e7aa82d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77606825-6fcf-4cec-8abd-80b41f15892a.json and https://artists.proofprofile.net/proofs/artist/77606825-6fcf-4cec-8abd-80b41f15892a.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 0x3b40626516dc13aa96c127535f7a38c2a4bc7c237ab5081bedb4775b0e64ad83. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QM6N21877331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6334064da477c1eac944a4e000b81a220bebbcb44c279de8e336961e0e4b623. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/US7VG2278193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c0543723ff61aa181080472d7c1ea16784c9403b3d033fcaeb8711cc70ebff. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM7282458941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101ec8f28c0dbd4e7efd247609d86ed1e005113fa3a290bedfbb6892f4ae3c39. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QM7282458943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6c6556ebb324feec5ccfd9749d14617b036f1c972b05471229967d4c627030. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QM7282458945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03576a453cd309eb19e1eb7a05596cda561024ae406db4cb34c28c8e25e07a32. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM7282458946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb235aaea664643675c6b96bca2ca729ac91c8af1f46f99172e54505d77566e7b. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QM7282458947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac005755e1ed82e54d10ee54f33acc28890c3cfb39e901e7cbacaae7fffe359. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM7282458949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4774a087f63726cada252751ac68aaba5779240013cc57d440678f8499dfba. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QM7282458950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33333bd31711171e60bc7a7e1a9041299109c30a43f455fbc8f7f45f72d29b04. 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/QM3DF2192429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc01d0158a193881baf8786cbbaf6db561c1333b21b07bd57a960cc84e0e6b4. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZHZ32249070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ad02023cfabe3f83f80740bd4be2c862163eaede7d4fb9e82e8651b248b992. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNJZ2251732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ace6e8869980375c7fc25fcb6149507a480bebecf34a4dfd106bcbb1a7952c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZFYY2204428.