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 0x3db2ee3b4f3c5550ec5e884874d1e82632fbcc1c7c8f5f90c089e9115718d1aa. 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/4fa3cf7a-10ed-41b7-a3dd-ac58c31ed01d.json and https://artists.proofprofile.net/proofs/artist/4fa3cf7a-10ed-41b7-a3dd-ac58c31ed01d.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 0x0e0ecb6ed58cc1924a9c4892c9e98ed9afb5dcb3934d1e20dca5a34c5f99d84f. 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/MXD781802282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24597e247bbba8629cdf68def2ff2d9c028b25bfc88682bc5e1b82d7dd44c47. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/MXD781802283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb632e524c951505fcd617b393e2dcdd73a21535fa1e154fa4b4870342f7944fb. 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/MXD781902036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998d770961aa8d09406482d4e0353fdfcc7dc79801182ec4652afc39ddeb6b8c. 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/QMFME2055687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c434fb2e906b8b278c90b00380b970d44a0ac5075294e1da6391c7b1f8f5c05. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/MXD782103208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1793e0a9746ce837be275c5d1859e6cdff5894accb417bbe1f45fa2f364e9b7b. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/MXD782103152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72ab6ce92b675bf8ab239c72ef98ef4b2244810842b7840e0d772a4f4c1f465. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/MXD782103155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f1ea3fe4171f82ae8f905459c986f10e7f28926754d8605a7d69cd8fa864ef. 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/MXD782200380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf670490aaf6a70948d825afecff2b0aca43a1d6546ef46862ac418adffc7525. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/MXD782202935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c13e65e369d103198ba328d2b09b5841f77da06365781bb6cecc8fe86339a89. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TW2323893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cc60652c2373b43555eb71372a32e0a35b2f62bf86acc0b1d1003cb8b21c1f. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QM4TW2323894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e58d683aed1533e5c4253396914d492085278028d79dde70b148c0d9689b94. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM4TW2323895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef251651c16486c8e1595e1927f1fb4100012d57e9d0c97687b2ecc9a175cdc3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXD782302165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13bf3de2453f300d40253bd4e3bd86068d449b7ed5e5da6d49321ad8c39075b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWV32433663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933001b777a8d29a05abd61de460b86ecfb9c70cef9fe8c47be00042d58f025d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWV32433681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd9d25faa8f9d7659afee130c4dca12fc9837ea41133a0dffe6a82c03527205. 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/QZWV32433700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b60fb91c890b2a3af01244d6fa97bafdd8edd85eb0a33501db427b9d9e3bde. 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/QZWV32433706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511741f3a3429378471d2fe8c671a3a9146dadffd7964661e1291b8276e24e53. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZWV32433708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf63956147ec6ed883981357081f363d7a04cf0a10393a5b3f2a43ac9f83be8e. 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/QZWV32433712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8b539c40012b79bc566eb605157079e62e9b11f6d3197b686d81d232fb1d9f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZWV32434678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424d91265d0238422778ad9b88725889db8e22835c340ef87cc7e579814b355f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/MXD782402340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5535f42c2a52561333c7f4901445261efd5351ef42b500784407bcdad000198. 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/USLZJ2538103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e1692620674c0045c3e52e6e3bcaca7fa8b5170ef7c36a63146c8cfbd928ab. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X42510746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f72c973110479969a6aa2e14d21c327f6f878deaddd8b1e81183f457f9eb65. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QMDA62519610.