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 0xc9195c44a53c2ac12babf3a01d5da293db1d8773c2fbdc8e6037ce3ec043d6da. 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/df7e21e6-69d8-40f2-8afb-b86dcc5b0e74.json and https://artists.proofprofile.net/proofs/artist/df7e21e6-69d8-40f2-8afb-b86dcc5b0e74.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 0x8a4a07a07e378bd6bfb0dc35db4a9d93c1e238efbc9e896cf4a05985a8c9a51b. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/SID051200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcc209431d8fca52344ee2fc8fd1bd6341c7cb9edde8f0b69cb214a99253e11. 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/QZK6Q2254515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac04893defbc77441b414faf0af4c8648adf1fee7774288231f692c847639c2. 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/QZK6Q2254517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e7cded906ac0b86dc4525551beef2d0ada7ba699b97df9cac7675baacc5141. 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/QZK6Q2254521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8afbef9244543fd1d766d0e7fecc37b0d885a665e875cc9abbd62cf45b7a5c6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SID051700081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e969159487df65c0b43a04f9f8ba870af73ab5473d45caa8d55070c7afe2983. 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/SID051800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e566a6ef57ed49ef94065f1c02e3c71dd9c40fed76b76970098e16a0a364995. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/SID051800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a847f7009a309d5fc5926acc28d010f3ee844ba65dc0b809199b749be68451. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZMEM2489016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431938ff117b25394ad1312f5c7de30fde6c06a4ef247e8d31222c124ca04005. 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/QZTAS2416026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d11e8b8160ca7aab580782ca8e2e5c0d7cb752d8bccc6bb64af9bbcb2d903d. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZWFV2423838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff35098d3f01c3615535b71de14a0a1f32224573de2af88805ed0a63c07e51ed. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZTB52547301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9597b939880087f5c2739eaa74ec3b0699b463eded5782084a82b9dcff83099d. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ782563516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0ea9fe4612908b7f790f35189d3ab4eb894358ecba2b15d8a001ea124f146a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QT3F22595508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7802f33e615e8300aaa7033e74dc10a5116438b943198f249a12bc7a1df5e07b. 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/HRA041787678.