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 0xebdf15e7c7163f144be61c20f9845761b3a34a96547db75abca40e72646a7f17. 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/8627ac1e-2777-45e7-b488-77aa9807c295.json and https://artists.proofprofile.net/proofs/artist/8627ac1e-2777-45e7-b488-77aa9807c295.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Very Last Songs I Will Ever Record (Part 1)
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 0x87a632dcdc463f634890c4fe3b94456e310e9e361de3e2503540132ba40d5406. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USE4R1001006.
W00tstock (feat. Chris Hardwick & Paul and Storm)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea3c99b5d601dda71c65d61d89dfa0932359a1088e31ae947be8994aea6d246. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:34:52Z), 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/USE4R1801001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4eaf316a7779610bcb0ac1e16975c5b208692068e1d6729b252d2536a945cc7. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USE4R1801002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9a17238fec779fa62c1e8e16169794e03552054c1de964c8034e76de720f43. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/USE4R1801003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe227f077464452165c90560366165f66acf85701c79bde4c9f39a011e0508516. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USE4R1801007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a23b1e0a6b2b230f29c6a62d4178547338454341a72699fc4c9b018871da084. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/USE4R1801008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217bc86963e21e33b468e5d97197a933c3b1cdd1b65f1276ab102e4ae0b49d03. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USE4R1801011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235a79ef0f34b2a6ef83bf3ab92f6471c6fbbaa0b87d192499369504d0aebb88. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/USE4R1801013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3da070c31c2377cf424e67d8adfcd1a2c547e0e1880e35f06681c7438741edd. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USE4R1801017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccbfbdc7200fa0ae9c73f1805ee67384e291432d9bd98872d09c50a92badaf1. 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/USE4R1901012.