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 0x83ac5a15bf5f17cf4af57ff1edb051f1db2f1b09b4e775832614c58c56c78607. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0759882d-a3f0-4c66-a4ce-8020aeb15851.json and https://artists.proofprofile.net/proofs/artist/0759882d-a3f0-4c66-a4ce-8020aeb15851.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 0x798778842b9c6e1c8391b21f33d1a4134af22d86d54e3aa29ca6edde6a3472c6. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKD252300231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c89ecd92f666177ddef2854d0b11a5f0b311e895bfd231709a51afe14346ab. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKJ962316112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9aa2dc14534f4ad267d8cd5e56dad86be131586bd532031e3134d46c164b0a0. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKJ962116111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fb0ed72a0f3321dc5cf3c44deac7403416b4d91d9911f584bd6afc6768df64. 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/HKJ962116108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32198372350495942434f706ca3e540cf539eb5d19b74b34e701ebbaa854c60. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/HKJ962116107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18a9c3e313f93a02487e4037ececfed16b48a0773e5668f493a1e7e93bde4fd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKJ962116101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7855e365f4d6a6429204dd297af85ca5b75c2195fd7d081fc6916f147a6608cb. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/HKJ962116103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf329ccfbfa38dc83acd1bd29d8d4bd07863391a889b777fa31f22905bc97e8c5. 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/HKJ962116104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a26ba987f43a76735999d459bac0d3b2957fd1b02c939d3e7506d3db504a10. 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/HKJ962116105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1fc90ca7e144705c9c81ed5a92d3254e3f57375f0dc367e39bcbab137d1bf8. 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/HKJ962116106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b644c35e355e24034f1dc99d5773faccdee9fee3c64ed3c03df2651754d554. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI492112002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e082fe9832e1c9fe8ccb3464c19d15ce2cdfc3973a518d37253c0e90d1e1ea9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKH142004601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72e845ac5f3b2fb24d64789b211e3f76e85ebfca9d574ba725c9a68be21aa70. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZES71991716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9eb0ffb59f337643d8d7bd05bfa039657df60fd035dd8c563d3b8ff82c83f5d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES81869527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0980bd5507cab58ed420d3301803718ad655a0c4743abf74acb9e55684bdd74e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKC652400271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c38ecd4ac64e1babe3c2f9e6498761de07281b872486b0dc6732138cee9b305. 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/HKC652400270.