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 0x8d852e3f9445ae6ee508e8b8e6ab3693b76f4b62c3876eac5dbb76942c2dd3b3. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8c987ae-65b8-4be3-b2f0-d66b9c3742ff.json and https://artists.proofprofile.net/proofs/artist/a8c987ae-65b8-4be3-b2f0-d66b9c3742ff.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 0x65a4e3b71c2611b088a64db4891529be94d1b59ca1b9c26466e52af26e019cde. 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/QZRP42307308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea5dc2ff6cb6b44c5276ed13a187b31422edeb6c0839cf0ef3cc6a63ac5d8db. 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/QZES92379019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c7b9012a44ad94b36ccb380bf1f6784538090f96d908c441e04d334e06c3b2. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZK6Q2369212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8efbd75876da3985aee3bbdfa9a46dc0781df75dc9d3e78d082c23b1375e41c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM6MZ2221930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5531c1ad44708b719b4fa6a9edda8ad1a5696c4397fbcc80f7e7fe629a87af39. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM4TX2212753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566494a8cfa625c5b9d84ee604560c3f13a06e13e8e99c2c32384ddb3dcb89ef. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/NOVQ72502010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172115f62edb6b8ed0a7ac6e10e2c074f40b36884f671dac855d478dfa11ad8b. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/NOVQ72502020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3802a1ad6eeb32e1f5f16e88dcfbddb2482b0d801ebf36af8f3390ac357dcd72. 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/NOVQ72502030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb66565d6b7ddf30fe3e8c55f5f88ef4f42bb908a0fb30e308bbdc486bb7558d. 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/NOVQ72502040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9424070f1b3c444dda5880a3685d95bf06121a46cc0ba53c45214dc2c05154. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NOVQ72502050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f7611836fcaca069783ff068863efa745634095a15c375cfcbedd3f3416811. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NOVQ72502060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613170509139bfb9d38b41679cd7ab14cf12da3e3841d7b47c6856819055f2d6. 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/NOVQ72502070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c19970c42416f02965271f38b46ae98c46ebd31d647b34e721f0902f9dbdab. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/NOVQ72502080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f7611836fcaca069783ff068863efa745634095a15c375cfcbedd3f3416811. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NOVQ72502060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3802a1ad6eeb32e1f5f16e88dcfbddb2482b0d801ebf36af8f3390ac357dcd72. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NOVQ72502030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613170509139bfb9d38b41679cd7ab14cf12da3e3841d7b47c6856819055f2d6. 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/NOVQ72502070.