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 0xe3c9915dfa09f6cd1ac45497c91b0ec6a1015b9782cd66cab0ad6366eff5b6b3. 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/3fa96579-a023-4d54-86de-6480687b7003.json and https://artists.proofprofile.net/proofs/artist/3fa96579-a023-4d54-86de-6480687b7003.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 0xe6bc0b4244c554ace8730b8ab8164fb259beefcc91c0104445fd261de5a3bef2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTBB2342794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a50a93aa33ea1e70835d27414944891b0d3a2b723ca8546d6764514ed177068. 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/QZTBB2342795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295a9f992742bc061bf4d4dea6f8ba7b753b93be97bde72e98504e5084aa0528. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZTAZ2449890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31391a0eccea0c0fb04f940bec50d37701a3eb244f1ef1870a50fcdbfb5d1c3d. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZWFE2431163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a48dc7d7e2a3beddb8af346848500c2c5f6dc3ae183b7c7ff63bfb72cf92b4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZK6L2441805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb23b3781b3c9d5476e6f51a11279398dba31e803cdbe49d348f2454e1463a61. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZWFR2493753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc7624416dd5aaa2b894e65de0807838f2fdfc3ca8ef3ea616e8d0cb1a4c423. 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/QZTB62215668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41d602dc4b84eaf6be8bf8320ff9e37b1c8b43053d129af325e167a8b624b83. 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/QZHN32517641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f683c5184cdfb30de958ee574e9fe7ad260c1d7f3816009a10bdb866afacaaf. 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/QZHN32571490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bc0b4244c554ace8730b8ab8164fb259beefcc91c0104445fd261de5a3bef2. 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/QZTBB2342794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa685b7a83b24e09fb5699033e7aeebf1b841b87312f1751f1d272525ae9c65. 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/QZMEP2517244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa604bf1d6a595504a733bafaf060c878c0fa65b38ce5178cb13ce2ba409e15e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMEP2517247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b520f3997d214d93ca0a5232d7ba8c348a3363173d289a9005de69c53a3abd. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:41:24Z), 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/QZMEP2517249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf198135068fc4622a654b427d27cf06735b8a7bfc04fcc4ba6e2750e00815857. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMEP2517259.