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 0x45c31e4bc245e78d5e00ed44b2ee5764ad91a5aeaa649f80b43da65587d1bc74. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ad4d463-edb0-4f06-a3ac-19f87416eb2f.json and https://artists.proofprofile.net/proofs/artist/0ad4d463-edb0-4f06-a3ac-19f87416eb2f.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 0x5ad7c52ab8e38bcba37f378c52f9cbdf68500ebdd84e9f029a860b278facf4a2. 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/NZFN02400110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8801de6360cdf33dca141fd5575da25f0d545cbe5dbc99e8e2f1c0df2e32bab5. 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/NZFN02400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3faaca93cc41e40a7f5b5667cf1b81ab96b739290e6f407715bb4ebb602f46f. 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/NZFN02400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d732e471a1d1c5e2e434f6bfbe1c33b236840f252ba590d1c22f027293c39e7. 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/NZFN02400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eea06c66dcdf518d2597f338279fc3dd831884b48675d44977e7c2090d0b80f. 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/NZFN02400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87ea748379f8fe489cfffb03ae73c36ef46d30482cfd5ffbafb22887d7a7559. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NZFN02400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd54050888548f29c8b1e1e6edd4c5a92ba87f8e7a2e53b19b26ba5ed7b77765. 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/NZFN02400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60df46b0d2482d347e466828fd0450c90bbf35fe4a173fb1abe1f4b508f1e6ce. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NZFN02400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60df46b0d2482d347e466828fd0450c90bbf35fe4a173fb1abe1f4b508f1e6ce. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NZFN02400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d732e471a1d1c5e2e434f6bfbe1c33b236840f252ba590d1c22f027293c39e7. 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/NZFN02400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6f71d6447264f3afef4a9ea25e9ba8d2c7629e635461439e44783b62f34ece. 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/NZAM02002226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a47b5723f2e296c9812d6761a67ede94f795a928ed40fb21868a5a5e8109d8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NZAM02002227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81ff7603017ab3f38dc46daed89fc7a93b01c0fb4d3373e218193c851be8132. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NZAM02002228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11bd2ef5212999abc092a9817763d8b5431240ad7bf80e216c779e8b89bbdf7. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NZAM02002229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa328ff51d4b1c8280f7511cf67d305386fb9383c10783f5db9241a50c5592148. 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/NZAM02002230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204cfc1b30b544407fcdd642f1c2fcfbc85c4bf4a64763c6e4d3f2e725f9d851. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/NZAM02002231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e3995d775f834bbcd162f4da6c4d905cc80f0cef361ab27b5b6880751837c4. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/NZAM02002602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9106c66444765b74b13877b5844edb7b56034fcfb571f143b564d6489385ae14. 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/NZAM02100397.