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 0x8e83d625159f713bf15c09b4bf82358793f44e465656d41a26490c8aa2bcd257. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab4d70cb-f59a-41e6-85d9-b009cc965f54.json and https://artists.proofprofile.net/proofs/artist/ab4d70cb-f59a-41e6-85d9-b009cc965f54.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 0x59469fb3eed724f6edb6701178f4dab2d17114670897718ec8667b6993236887. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLCK42238216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843c2bb2d4b2b5fefdc4a3cd6101154d6b9e55e425e0ead6d4b9888dfee974b1. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/PT2DY2400413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb8137519dc64e747f47d77558d8db95ead360ec94401ed5673e45350cec574. 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/PT2DY2400415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8606702c13b9a728f42442ee9a43aded7c726c1233f9a9727538c5ec4bc745c. 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/PT2DY2400419.
marginal da city - Pt. II - Trance Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e769da8fb03527f633f54c9e6a3e1ffe6cadfe147dd49051bed5798ab1803a. 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/PT2DY2400421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886f21ee6596038f057640e0ed3b7a0f33981901fbeaca4cb33e37826074ba4f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FR2X42486248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747b45356bf65e6cf76b7cbe910cc43c479ffe9873a0739c9a3ebeba734b8ce0. 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/GBKQU2417514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f441c914ed89cd2ecb371da820a888dcab5b52cb7489f5a7c93fd7dca42693. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBKQU2417515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18afece9a374e325172bc764033f20c653b3d02b7424eb9738431a8af7dddbb. 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/CA5KR2357355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d88cd04a20250cb888099110ac38076d345f787fc541f9db72e683f858a2018. 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/CA5KR2357356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaf343ce83aeb5abe67d1b6eb8d70341c997d6c4423bf39e8a0d3a8c0ca3a31. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLCK42230344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84d3ff126a2b4180fa0109a64b57d29983c442d82bbd20d298c2a2916420f3a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/BC5A72300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf53f5cc8762f8e23f9aeaab4fabdf41e733f7a15552d090027b489f7da2784. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLCK42225937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a5832ba627369878538b7a978792bef45d7bacb7c237bf9d58d1c2941c85ab. 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/NLCK42225938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e138e5618a8ae481843f36eb8f8c92021dd2770b6190035f95699594f2e498. 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/FRX202230914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01a1bee636381fbaf40189bc708ad1069eb685e60fc814163467c88b535e55c. 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/GBKQU2415285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec247e666a2dae5b86f669f30e9a3214dedc1e90c1c67d54aef40d5478b0c66. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FR10S2476730.