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 0xbf387db0095a3379a2568c29474f77c760d7afe91395afb25c68010e41bbd411. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81899d2c-0ef9-42d6-b459-640378cc75b9.json and https://artists.proofprofile.net/proofs/artist/81899d2c-0ef9-42d6-b459-640378cc75b9.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 0xaaa2c9b235654e18c0ea0c7064c3afd91f88d2b2299b5dda28396a8fbe47ef39. 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/GBLFP2437741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cead2f8d502717d205fed16db47a61df9d0e8ca0b819e6678ed558d5733b8a9. 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/GBLFP2437737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92fa3862b4b70450bed45b38655b3668d73a74f05e2b77569926ce003091c94. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/GBLFP2437738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a646c8e598fdf1046ea500fb3e636c82b75000f0edaec5dee16c84b0e2cadf. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBLFP2437739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33f789ea648afe3d3e4f33d0b93215f1e3bd85a5fc893d690c824ccbc1446e1. 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/GBLFP2437740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07db9bf219e53873cca9fdf9e93c1f8afa9e48e41369432c3d435f8d648ce781. 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/GBLFP2437742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fc3d0390c97af3423acfb9d0d4a660d2c57930bf5d4cc8ef9f1eddfcee31fb. 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/GBLFP2437743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5416edb5904d31a3e09facb5145a30698db7d7bf63537133d976809ab5d7fb8. 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/GBLFP2437744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54457acd40b46c8702bad840a3f9eba33890ddf2859ebe173053fa44ccef0105. 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/QZNJY2463248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf173dd1d49179af12ac14dc9185a7ef96615915d5a9acc3c919c542c4bc5e1b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZW9K2354033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90ed22e702792ca23c65fa4ad3ba4a8e52b36901f3d09283652cf52ff8ae609. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7VG2233056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4beb833d4c3190537c7e37e860095b8f05b0f6e18dc35f00f81dbab7e23c9f0. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZGLM2141256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efece65d2ac8239114c64013ec3b747fd395b9a36f6c98fadcbcd24aec5d31b. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/US7VG2121141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7059b6fca1353e603df3e3bd63b00a5b54a11c9a97a3e18cc1eca67a1acf8310. 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/US7VG2118052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9b2a9b26b2ae96c1e977b50dfdf83cee49bf83bfd9785bc1386f13bbb3f691. 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/US7VG2100414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e88431166dd29e295777b10309fa532c98d2cbe12da1355218782f1c644d4f5. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/US7VG2100307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090885e00b9465583d698f127e01c8c992e5bcd9d0859bbfb7d932bdc05e5d46. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ESA011963438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc44a97ffdca59e6adb62f3a5d64138d2fd54d5366ea97c5ffc9e17d00b17bc. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/ESA011963430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4024c587ca9253755eccce67452b7279f6408a50fd6c1ee79a84f0cef9578400. 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/ESA011963416.