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 0xfc31abccac7f6efb232a58f81fe7bb809cf373b94965a503a335de87853ca286. 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/720fddc0-5429-4892-b33a-e9ea15d0da6a.json and https://artists.proofprofile.net/proofs/artist/720fddc0-5429-4892-b33a-e9ea15d0da6a.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 0xf465645c21126ce46276e75d4f13adbc07af27932e4ebfa083a18fdc0f0af856. 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/QM42K1870419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf465645c21126ce46276e75d4f13adbc07af27932e4ebfa083a18fdc0f0af856. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM42K1870419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9b47fe765c13fa92b39fcacca31dbbe7c787a2bc319a0a964a5043372b6746. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM42K1854296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2b0e64ebeb2d213bc312468ddecebbef33b9d423d6be2cf45b0193b90dc367. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QM42K1911197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc32174fd498bcb59c3a8e9eaee5dcbfdf4ce3412eaff67f0350eb775266dbbe. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QM42K1955712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa59e4cc69e26c1ce30eca395a54f969cab56f11c867e8dbf0fad03ef809719. 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/QM42K1922322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa400d0b7ac1cb14aee54dad2b71caab76df49adb4b1351b4763b4002d927700c. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QM42K2031158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ccee2bc2ea205585b0398d479b4b0b9d9870fa0af0963c174a9e1e6f1c0848. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZMHL2091201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ccee2bc2ea205585b0398d479b4b0b9d9870fa0af0963c174a9e1e6f1c0848. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZMHL2091201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32f6dc1036679c0f8d4f253a175337580cd9b6667a736814d627c5ca4922681. 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/QMGR32203304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60c17c1f694ecd9c60be8355ec3dc494b2b7da5338fd398ea07b15e406a6a1a. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZMHM2059876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db5f84e15faa403f5f0b7e5f08e1f7c88a476c6ab743ec90e3638c35ead201f. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZS642188819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05ebfe24700a0c2cedb41721bae53d1efe9375af8f037c5e7f5478c5136d345. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZS642161594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf501fbc5fd6856a77edfc634b7db6c3eefc98b8abc19a53c625a5c0ab1e89c9b. 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/QZTLA2279248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a89cc07ab78b42e7b4b170b03acfcd8b5860d485f7c370eb2fabc2b06bbad8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTLA2204332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03afc47bcbaa5d3ccea3a2e9073b802237106411a331a39539d45e5e932e6c91. 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/QZTLA2252877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2a41a8e0cefc7286b18d6e6f8644943adaa359c7849dfa0e8b9311d6e719dd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZS7J2271061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0bc672219e779d19907df5b5dc3fd3cbc6d041fc0b844ff44d792a6d49bd43. 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/QZS7J2203136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35ab66124f7bafa9b5a36d4b55d89ffb1fd30a42298511659a19725f972d0a8. 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/QZMHK2381519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc482cf0ad61a6485ec3436d4c08fbab242a4a867a02c4a1fb750970281c67b4b. 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/QZMHP2478655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc482cf0ad61a6485ec3436d4c08fbab242a4a867a02c4a1fb750970281c67b4b. 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/QZMHP2478655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c7b3d1dcf2e206cd174fbd0d7ba87afc93512c6f5c161d448ebda80899c548. 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/QZQAY2535951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9a982f1a8cdb60dd9ff6bd573e161c5f342cdddff119cd4c85c3caca839ed2. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZQAY2539442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5601fb08bbda4635b18584278727b831db7da654e1aa4d17c47dd76afdd294a. 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/QZQAY2557488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc67a0d464d1d86d06275631a0066c6ccebc2b3db77d246ec14716ec7a6a2e2d. 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/QZQAY2502847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e108db5598efc013148d7054803e93f3a9ea014ee19cf32045678d8d1cb6ae. 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/QZQAY2572019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2c307f50b5e7e28ab5710a42031018d7913ca353fa7e4562390afe695b627e. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZQAY2548297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93b1cb82f14426a4a5d3372ce40c0206a8b6d6e81eedb9717a4dc760ca295d1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZQAY2555594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377ecdd6878fa4a74ce818e17040c88afea2524d3449ff8e6a20105a09eb8d17. 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/QZTL92509049.