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 0x4ef6443aafa359282e79854ed15ae46b6d865680374fd099f3d12ccdbb9d4dca. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cba899b8-ceac-4da5-a005-579d97cfa48f.json and https://artists.proofprofile.net/proofs/artist/cba899b8-ceac-4da5-a005-579d97cfa48f.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 0xf38277bcb1d979173f70d275b51808e0b23a107f1b71ab3268ef21d02eabe6ce. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3F82535728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae29f077bb640c779db548afca614bcc78329f3f85f63dc9e85f3a52e7efcd6f. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QT3FH2547215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbece958658699d3f2dbf9b22577c65f4b5965762a88790d299e504c5a1be5659. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3FH2547216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe31b23e0e3800094babef39d4e22123996b3cfa2aed0469ea6172104823a08c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3FH2547217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b382cc38029ea927352b7cec4fc546b32fd40f88e22118d1ab8479a0a7c0401. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QT6EB2536845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca66978441defbe56be050219b3a7db4b2aa9ba6f73132ad28fb009a094515bc. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QT6EB2536846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x036a02fffaacf781ddaa325bc245fff63fa3f195bc387134f97df4947d84f912. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QT6EB2536847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ec3533859df55dacf42f004686e1341c2fefc81592ac252306b6149de449a3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT6EB2536848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc860d12a32fa9a8e4d5b2fd7b5bc28e2c63783270690d25264714175eeca93f2. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT6EB2536849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d287ae5a727a6aa092b6837cedfdbf8c4415b986d3c8f6b49ea09405a46577. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT6EB2536850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9512920ffb1717f27b7d893e63ce96fb9424c7df3c45a88ce21c07523be4a5ba. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT6EB2536851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5aa386e3da9e96b42a4eed96a23a0da50b721d8163c58264dacbec0b95aa35. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT6ET2578127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895378b7106d9c9af6615322d4de43f53280fd58958c9c3b8289b266c5a3496e. 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/QT6ET2578128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fdef2b8733add5d15c77d7a474f90933ab1ed2f856e501c4b3b6165eb9075a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT6ET2578130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acf1a02df18ac3b56be8ce7124bc691fa3b3dc9e73b99a160eb98200e00093e. 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/QT6ET2578131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3442cad0aa3be6725c1db6db7268f51a944d9abc8544a4ba88e99118a16983d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT6ET2578132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4c9e18bf0a80052747991e82af6c24daf60f58246b0c5c59d496cd54860f83. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QT6ET2578133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee18220c14f844236e733dc3ee12e1f24b0b7e20c1013c7576d30fe49a9a813. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT6ET2578134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523a86dd8586c9027c01578b6868caab3c1f8f009589191b5254df7265c825af. 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/QT6ET2578135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef82a5d78a9747e6a584606bf742f1cccbd9924817781f654380395edd9519cc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT6ET2578136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9a375b0e059456bac1915f33ff786e6de2d760ee8ce66a9d2da872672e853e. 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/QT6ET2578137.