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 0xe09561ed14e89ac0bd7ac47f9ac8b22315e3511d7a478fad01591403d341befe. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfd888fe-1df0-4f1a-b5fb-9f25caaa57e6.json and https://artists.proofprofile.net/proofs/artist/dfd888fe-1df0-4f1a-b5fb-9f25caaa57e6.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 0xd64935a460a6e05e344be4f89fa4f66b80fffa3e55ba26467d3836c30de612db. 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/QZHNA2432539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc1309c1c0e326ac766a02d31e51b567408984e6a4114bd84db1d613f4f0783. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHNA2432540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe28c936acbedd2cd8d32c157a271324b72f220f34c5d57c1b3408c65c2d50f5. 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/QZHNA2432541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682b55b5c4a708f21ef42929abe06fd00cd7bd38c12542e72806726250c4acef. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZHNA2432542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341d5deaa77aa36c9a85844d30b8a2652e3e5a7433880c3dc199daedbb7606ca. 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/QZHNA2432543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa567535a7d6d99d033962d16814b5f05b1637604692418a66bad7d6989b3fa18. 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/QZHNA2432544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8082ec92bbd6d97eb2e0ed9cb1f90e2cc9158dcd8bb2473cae53f98afd307443. 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/QZHNA2432545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecb73d90ba035f9a444a77a93186545df9fa4546f243acb83433de809245f6d. 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/QZHNA2432546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce621ea21fa9d646d8d9239a2945a1883ce2fe1915d1c9e19398fd3597fe006. 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/QZZ7S2401785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94258d97fade340d282538e0fc4e45116db92d06b3934731bd30ececbed45be. 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/QZZ7S2401786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c3ec43134bf58a35ccae39a91e07f07ebfa6300957a2c04d1307a47b20ab84. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZZ7S2401787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21eef8f1a9ad171ac4a8f5bce9d15342e3bd304944d51e534c31ccd16765275d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZZ7S2401789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40db11f5ac466189dbbf0548a6ebaec7059363992ef331e34ef1e4eedd1fe96b. 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/QZZ7S2401790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb84d6313042d86b747fc1d080d5659c0973bee2c15539cdb5ee7f8f0dc3739d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTAW2553263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f493556064c1080d8adc80a4f9c6195ba444943e98cb8bca74c560af439de4a. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZTAW2553264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc619923f1e1f029b0290773f99f194753f37ece4e3b1c12fd8ab4a35c24df45. 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/QZTAW2553265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77a033ddddc983f4e29f4c39d1bef842e4e8bb95e0aab57646e4f480fa8b3ad. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTAW2553266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421ca60ba6b43fc294931918240850f1302ab7017c4489881444197f8f0bb2e5. 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/QZTAW2553267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c633f9f3fe26e23e5d4fc34bce8e784fac1d0e4d3102ac4f7427567f32a6644. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZTAW2553268.