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 0x68a58413606f5e77c5f74676ba71840a6987642ec63e2a69560be5478492e2f8. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81a90ac7-320b-4c7b-87f4-05736f4fde46.json and https://artists.proofprofile.net/proofs/artist/81a90ac7-320b-4c7b-87f4-05736f4fde46.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x95d959a3abe578a0198e17a300e5bec6b45e55ed116b05bfb54ef97314ae478c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTV32512447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0069e9ffbf560cdfc14f3810ac47a79b4aecd29a2d4e1da8c55139954999fc67. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZTV32512457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2928614e1c0e2d96668c5763c439e665bd1424f8379a0b3cb85b3595900f3720. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTV32512467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19174fac208a0e9cf44e6e606cacea205068194c4315ca5a3bf3aa587b65c6ec. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTV32512483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71681ea00510df7814d2268d1c96bad319c65cc826fd49a4793be3c6e6370ff7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTV32512501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc613a692586f7ab038256f39a9f9ea7f6596e398a51251e4c40c876059afef91. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZTV32512519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6223a3bbd84a15c1a45cc30cb7b9060bc0658081af0318c247d317cff59276. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTV32512528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef0f7e42b93c2f024ce8a06f107246972a0b260db0e17d2d7f38ebc6d2cd4ea. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTV32512536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5ba2dbb01d7e2e157b889c0f44dd6d67088e44d8e4df4df7cb1153d07b17f2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTV32512553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e57a910c7f321336787ea7acebcca7eb34b63192b36b2dbda79a018355ff8a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTV32512562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c102c971c5c0e963ca2f98663d11b11adef9e57ee02e1267965e077834ecbca. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTV32512570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dedf23f42011b4411adedb2b29622e349b9a91d63e325417240646dd6435368. 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/QZTV32512579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbeafc06fc91b8b368ae4eaf33eea9abbc73dee75097146a955ad89bb9c4ea4. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTV32512588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb202d609006fc9a218fb41317bb3858767b1c532252b41ba87d9fa223ecf9a67. 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/QZTV32512597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357de55d7911214eacc59e4da60fdc78a950c05b0c0c825cfa7e92f9ab40209c. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZTV32512606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8686f66cd04ee47f7008f611d15c5a41a97f0fccf146a2bf681c257f0afcaecd. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZTV32512612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb58370930678db3c24210995bfbf8d1bfa74feaf8d2edbc636f2c7e80988568. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZTV32512623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe407a4093382895ab5d5fa25dec54741f6f3d0a51dee5d16f83e276fec4a073a. 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/QZTV32512632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ba88991bdf2070fbbac5ba64e3e75c6583103a6515dbe2cea5cc44f20e5220. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTV32512640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcfd7e48281be5a23f428617cc9f86062034709d4fb2301f890e90572294d15. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTV32512648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b08283ebd1369d5b31f505a312bf81404e27fbc0a375ecfd3aaa3c356538988. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZTV32512657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9da36773169952e47ea20f1ae684c5d11c1d195860128653b75e038d2e01f4. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTV32512664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea6d11b02feb31eaf2c1d813a6afc9d26c0ec39365a76b3e41d0b9616174e2c. 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/QZTV32512672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36149b2c335d0bc6cdcbf51fa2110145a7068cc7756f0cc99ef25ac275f793e. 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/QZTV32512682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd9ce3ee529df02962965b984fa5600501735c7b1824c6c7a7f3063d2c83484. 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/QZTV32512690.