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 0xbe62120c186ae10dcbac02925e902c13c92091696f0c7cbe32c79fe7e522c868. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce87a303-ed55-4fb1-9885-715f88d92e1b.json and https://artists.proofprofile.net/proofs/artist/ce87a303-ed55-4fb1-9885-715f88d92e1b.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 0x7d9107403f684dbdd47819aab7a5e2e44592ae44741f9f0e00b37cbe916eddf4. 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/DGA072428935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dc35ece3bc2899b9c2415bacc80c796c23e178860ccb8393527f8d4af6883f. 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/DGA072428936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35c7515b996be20147a070270921430df7cdbe96f3e8b90b4dddfa30a2d68ac. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/DGA072428937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9804a6dbcbecd629a83544b3f57bfd0ba49e6e4606996911a86de7b202a01cd0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DGA072428938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130fba816538778c4307048dff56158d1eb2431bae2f72ece7d3b8813c8d1dfe. 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/DGA072428939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9b1bd3abecab2bf8f8d27b8bca74bb422e15c659804116aa30b4a13fcde4c4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA072428940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42821988d96a73ddcde2e5881fe503d832f4c36ac1c1c9139b7ac574f995c118. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DGA072428941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831f612c95fe2d3a665767dc086c1b4f5a8aa0d0c86f4ca8b642918e0c8a579a. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/HKG732525953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c73cfd91be43515d34496e0626113cd85b067335d52f0bd86254b56a6c2364a. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/HKG732525954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc137df57bb4edbdef35444ddb1f21f6c29982299edc0670eb72f75198496cc49. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/HKG732525870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd346e09152a9ddf06f449f0bf44560e6944d796129c405641a6b1c1b977797ae. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/HKG732525851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31305b5d93c2e01913bc297823c2b1d7dc8047dd8ee3d17b1cc5a571c85f460c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/HKG732525864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06452756aa9bd85e4c9de29b5ea58d1ac7dec4ba6f6de9a85e1c34040cdf8e59. 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/HKG732525865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43faa39ac182757353a4435c84cee04463847bd69f49e4d24b68cce5fd3c295. 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/HKG732525867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087270ab4cfb2c192e102734e234bd979926ecfbe837dd52d9ca0168f774a87c. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/HKG732525852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd8a666a522945aac5dc33d0b2d60a3cb950557cf1288b336e3902750598feb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HKG732525868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bac978fab583621aecc3bdb723b1bf78233211193a814aa6c77eb3667445c3. 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/HKG732525869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc137df57bb4edbdef35444ddb1f21f6c29982299edc0670eb72f75198496cc49. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/HKG732525870.