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 0xfdf7c8dafc5c9ac2acc51db7049856382bb9d1853bad3ba59c3f7223a97ffdd0. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2fc94ab2-8f1a-4a24-a7b4-b7590c77aa36.json and https://artists.proofprofile.net/proofs/artist/2fc94ab2-8f1a-4a24-a7b4-b7590c77aa36.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 0x2416d30fc4ba38daad65b0691e06245e85973a8ffa407cdaf690d69759bb920b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFL2438744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502046a89420649798f27f07d6e2baa1e2b9a9ccd012749d7d0e70d21e9c0b00. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZWFL2482325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaca7bdf75f5e730f1db2118d8cebb2b3c0dd8cc2fa32f0cb73df7077240910. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZWFN2427206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3b2d230063e26f93cac49640b321b0cc4e78a7198ec372f174d74db95d3872. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFN2473062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f09871fdad2a229c16d8ecd15b4fc730a5399fbf2f4bfbb02cbfde10c3d6664. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZWFQ2488116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa2648b07106b78f8cc00578e74cc162a22feb5621427e9038a605ae34b84f. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZWFQ2488114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfab6a96437e01120f5f847b9c793cf42f6a0b6f72ab49a0c671a805c0703e5. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZWFQ2488115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f09871fdad2a229c16d8ecd15b4fc730a5399fbf2f4bfbb02cbfde10c3d6664. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZWFQ2488116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba7a31576c5e400ede93a5135234d3f5071d990aa7c0db6ffbe20d4b27e5eb1. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFQ2488117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e51cff988eb7cece4e9479d197094414e79f09801233c128b2bb4f456af23d. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZWFU2485686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef174bab2e1f4feb34872d028a17b0cc1cdcb8a4eeb987b6cecc4657ca195b9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFX2429512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c51617546463f76847f54f1f149e383b639b0625343215e1d426d8ede1ac23b. 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/QZZ7K2406748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3e0f0bb4f31c033b0983696d5cf6e3b2d99ea7b091e07dccc4b77277f9a685. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZZ7X2441816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edff1052a849b8d1c8d8c80333ccad35b2a163e7128e0a67dd2e956adac85c3. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZFZ62583202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be19304239f73f9b602bf1c484c9b38c45637c782ca7e897790f48002035056. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZK6L2572415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f31f586a79fcd46033ec9d5011872dbaa7a8cb6954a61dbb99002d821fba4f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6L2572416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119dbbe7771543c96313b3f75e41312a79e30bf6f6419dc5c8dec0f78aba117d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6L2572417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3426bf3b06681a69c27a2099747804c59643efa267145e377229ade507c203ff. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZK6L2572418.