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 0xc4fa4ed762c724a8f72d72c3ca168d0e6c528f46184009f782e35d068e13fe02. 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/1c8d4fa2-3531-46a5-8734-f7dcb721cc17.json and https://artists.proofprofile.net/proofs/artist/1c8d4fa2-3531-46a5-8734-f7dcb721cc17.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 0x31c2b0e3c3a794b20c97fa56eac98bcbeb2b5df85e2e89bba0c961dd20f804bd. 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/QZTAT2226776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b1a71591ed1dc5e015ab4c9c6eb8b127861172299d45da67423610947096f4. 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/QZTAW2306796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9023f1dd302a53ab70d522ea5fc34e7c7b6bf87478c4c2cb80cf8990166a3de. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZTAW2306798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3012d49e26aaf6755a11a0757ebd1df9faa0dcd2d78c1a301830c449c43f2beb. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTAW2306799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d0d2199c941c567a1bba4ef8311baa056d707ec278be8b7bbc5e4fcd4f097c. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/QZTAW2306800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d937627313d41ffff287fa6a653167acc16b80270f300c0bb22a7d993a33ff5. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZTAW2306801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51c270ee1c140b5ad03ea4b6c02288416389a0255bd7264e8479225eaab0f64. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZTAW2306802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e77340f6afe9d585e4ddf77621423cf73aa5cc2025a442210d322ed875aa56e. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZFYZ2496865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38199257842aca732d1692688c8eb4cc2f7b8b19f0d7450f24c058a1aff1250. Chain 2 (Bitcoin): anchored in block 958865 (2026-07-20T10:33:49Z), 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/QZK6P2443082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac50398c40c433edce396f38d26ef153256996a97039e0830bb3ee27da778f7. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZMEN2493343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6581c08ed2c43fd4795bc730b52ab41b3969dab2658820970e1f6714113f3e7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZNWZ2491810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a93b49c01aa56bc164d70a6cdd152e613cfae6f0cb211318b2bf1462e3d9d2. 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/QZPLS2457490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e73cb2e18170e7a275baca27f8c189061371d964ec4f1273a4cebf884946b1. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZTBD2441107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1bff889919d3a15d749c68a01cbf987e05efcf6aecd539ddd467391303d18a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZWFF2443640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88ba697af3128ebc9566118ffec7e20df573d3920be9be4559b118adc2ef1af. 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/QZWFP2441080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe4e0cc3d4c49789f595bf10ca46d9cfc2d36c6596929e72114abdddb768b73. 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/QZWFX2415448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b01b5edee19044f8ec79630a3c4da11fb79d76692525c810b11e1752617cdb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFX2415450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2840d83f2dc1aba8a2a12c5d11fa63a2b836ae926f40999e78ba6258a06594fb. 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/QZWFX2415452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61528ed1bff8d08dc5d97e53596329b5808dd6297618b3147860459d2b4e819. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZZ7L2405502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8ef39799592dac362a74521031a6ae13df4ed54f26e309f39d45a72a1ddf57. 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/QZZ7Q2426536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4a2cf8defde1f311e962d43e0b4e7e3c24322980b2cbd8116bfa62f5509f52. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZ7S2455846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecd58e48c09e22cbef7e1ea5d3fb510086a13d0a33f9f2efa97a47ee117586a. 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/QZMEQ2509387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3510a920836bf98dd7b02d2bf04e82cb1f9c10828e64dc69cac0028e2c65eef6. 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/QZWFS2543890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a875068d3c462070336fbf15e57e43ccc0272f25cf057d8e400a3f3e8263e39. 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/BK4DA2557536.