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 0x3d75ee03a15a9b7c18a55d4f1a0e7b4de298b1d14f9f16e2544f1a78814a40e3. 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/1d2b8c98-e2f1-42e6-99f8-ddd2a84f422f.json and https://artists.proofprofile.net/proofs/artist/1d2b8c98-e2f1-42e6-99f8-ddd2a84f422f.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 0x5845435032385767677f4d19240655f59302f11d345de7b57a19c1d995bd6586. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6N1909695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d930f584d18cc93eefc3bb2ff3bfcbdbabd0e39f9bca0fa1d0788eb4d47b4f6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFZ52017851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c8f94e823dac4b391535a268d3765368ad5d4a84e6e7dd53b1899f030e90b1. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZFZ52017852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37320283fbc281dbe1b0d27bb83d8d29e1ab5649c532a056da6f780361e1772. 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/QZFZ32086332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993a3c1efa4e9be77eaa4cb2e7a2f849f52b86e765b2db952b129eb11300005a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFZ52017854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35be7e2e1a0050f0c02ea4b542bcb796d52546dd0b1013a38df6e8a21801389a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ52017855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6abab9b128a5e50a62a745d914135fd3f40854647deb67d40015f5d95b4d57. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFZ52017856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb223fdb9d6137f83cdf62c373817b3dc0d90fb07c8fa5580700e5777cefa59cf. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFZ52017857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c01bcba73245b4e48ca21f54f7275d051db0ca066779f66c99ffd01ef8e66ec. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZFZ52017858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8980fcef9ff4e82f385316c6cdb2d5b175aa8a07dfa2ed2f50c91101b9f2381b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZFZ52017859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3042a131bc81b5c109edb3fa163766f3f741f7d2b6681f516b32e2a4f99a298. 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/QZHN81971524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7d393ab2c53cb3b71e3ff133037aafc3c1fa41563c4ebabab4455798126a0d. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZK6M2071671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeabba5edd0ed2f7c29143dc35ca23032e62c7a60aec1377c9041145e04e4a7d. Chain 2 (Bitcoin): anchored in block 957676 (2026-07-12T08:20:25Z), 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/QZTB82258924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ea732ffa1d2bca9aea4398295c0a9033acc6ad26d8ae38ddea23c2b3835384. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZRP42247130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2edece8e8846cb3b8fcb5c46a9759043fad4f1a92a2ca656df7ee3152ef22cf. 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/QZTB82258925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44110e39b82e4815328091ae95ad5ee5085a09537faf9a30a795bc05b3df67e. 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/QZTB82258926.