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 0x163983d92dcbcfb7c04f39a189cca630e6ab5b110ed56a2cdac389dabb41193a. 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/86756da5-0605-4c6a-bf61-5f0f7005f107.json and https://artists.proofprofile.net/proofs/artist/86756da5-0605-4c6a-bf61-5f0f7005f107.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 0x7f9737fbd5f13c3109a31b1b4e7823636fd089386e823fed2dab642a4b3de3b5. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZAMM2283430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757bb9878119dae17cb83240e39dea3c3cf13479380f8e12bc0fcfdbdd8b171a. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZAMM2285409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e483b289fa03ccaa2bf8e86bcb8a91e74a1919b8cc865c2d5d32ff5113a684. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZAMM2281711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5c1f5db63feb7405aef0bfcd1a1805fd496679ffe6db62bd4448a13b905a12. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZAMM2285410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb204a7a4564468cbfef63d23644ce9dfce106b240d835074cbf43839da77b7d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZAMM2281367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6627fb08501ebea20ba8c95671ba6c2618456be98d3eb2dd63a8f1b66f1bb6. 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/QZAMM2285609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2de76337b8e15a9fc71c0b4e2fd5db3e047c19185dc9b2aa4c1030329c4a60f. 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/QZAMM2285411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10be3599cfc8d70fede71d748fafb986343e55df30b4f3c2971318dfebb1a263. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZAMM2281867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247c317ce81377f046013056d651f259617803952e634a7a0fe57696af61980a. 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/QZAMM2285412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f30373833a8f032b884c59b1e14d9a3a1fc8f596a33bf9b4dbc8cd199647bd. 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/QZAMM2290032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc085631b76c25a07c38043f24a3ef181e79543ffb523f5d4ac120b98fd0e6398. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZAMM2290122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab8de4eef5ed1c95392c3bf7273cac819df96088cd7b4d11d2a05cbe9f5c1ba. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZAMM2290124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52e70ffd91ba83139d00c0d9ff62e9bf4cad6ab1f92c1ad65285102cc6517fd. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZAMM2299674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ffe459cafaba32f51fd4c2c580e077bef9a4d0039979ed72ea97b199a36134. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZSR42201616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06cdf87ec7080b1346b28eeb4df7eb0359f2d0229cf3e480e5845d69bef9930. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZSR42201602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a52e5eda6ae2ac176f7248ebb05db79edb65bf466dfefff7b82ccba45b09535. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZSR42200045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb39705c7afbf50ac32a8fe7f1df0cf3a26e1b906db5788428235ee250155275. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZSR42202794.