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 0x339337e3d00b20d22f7f45ccf1e3275ff0ff90692ee7f3c679268703c8f7ce3b. 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/54e856a2-f041-4b53-916b-79bf95c2fd92.json and https://artists.proofprofile.net/proofs/artist/54e856a2-f041-4b53-916b-79bf95c2fd92.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 0x6a22d4fe38f288caa8623a55ed59dd375b3a38170e726e3750223b55d1d239c7. 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/QZHN72531538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b7bcac2ef8419945fd5f1839d85c4793990953954675e5bbda23c4723e7f3d. 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/QZHN72531539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d396e161f77ed441abafa1fa340f25c0fac7c13066559e603f55f2b9e65111a. 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/QZHN72531540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566025c8d5f0afb4d3da90748cff69b15795935fac805c85f10f5e1c031f3082. 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/QZHN72531541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88f7e8a15e82624c90e63802de80ee67769f84395077c5dafa4ea2e2a0b383c. 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/QZHN72531542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d6bdf84da7569791e203dac9f80f7267343168f37398542f16e58223f8f300. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZHN72531543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1206aad2d768dcad90157b690871574a5db6f465183a3f3c4ac9a18fcebba0. 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/QZHN72531544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6bcc95924af8dec33f3706292cbe5bf98cda04bbaae7f3e94b9002c2f2e8e7. 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/QZHN72531545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f3aa9a57b0ba3eb0505878d943703b312dd2ab25638d307444414e8f21d947. 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/QZHN72531546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1484e5c96378dbbf2a03d12d3866f442094d57e00daba0925c1129b49a0e92. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN82254364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08f9bcbfadc0342ab5a45489f29800212e4504f8b337c590000aba0b58e3033. 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/USUYG1427334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03573a4d891b6fb72138a71390726b240e6228d9ffafaae8c350e1d3ce209199. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USUYG1427342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba2a607054c9f5f96d1a281dfd3e4f81044738371694b5de2f0e157c4016e83. 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/TCAFR2130815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a85ce0e4de61757bec6178a6a2b931835e56b4ddc3ce2fc7ed1bab353c5563. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QM4TX2072219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9664551980e4912ffc1a12d4ea128c7e3ce286e1ab23556dd50664531ae6eac. 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/QZZ792447229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46a3b58a0cbf2d367fbf8a3283adc17efca7bbc583564ec168ccb5d635b5ba4. 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/QZZ792447230.