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 0x19adde12f965df9cde5769b6b6892a3387fb247202aee4cd7fef056faffffae0. 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/fd8e720f-a2ad-4a3d-87f3-052a01af3d71.json and https://artists.proofprofile.net/proofs/artist/fd8e720f-a2ad-4a3d-87f3-052a01af3d71.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 0xdf6c27166ca3227ae428eadb0a7848c7d261ec8c0ab9a2838746f7851befb916. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZES91984162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cfa6c202731a42592db89a42c1eabdb75e2139cbf9a1bb4a094eb05b1b5014. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZFYY2147669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b244e8bc158270856d48d8011232aa7e6e3c0bf88d91d7a709c29af9bfe8daa. 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/QZHN92144970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89cad399a0573f633dd186d0e5ee8e26eff183c69082524ffb508ac747fb6f0. 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/QZPLS2111402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4ea27269960477e24f721085909c7e10af1671d0295cc921973f3a2d35ac2a. 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/QZMER2281465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901bd323b96ee5c77437055dabb92815a648c61bc91a14ae795daaa23bcc7c05. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZES52363650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f0534d54aad594503d6099329889d7448a109e039e11d92d51410a0d2dbeee. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZHNC2359923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7b50962ed617b7cd6d67461c4831730683cf9b5c93ecc1d5d24576b33c442d. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZHNC2359926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb00acf8c26210263ad578fb69ef1c0729b0b3d08a0bab6f7cc1982c685db67. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZHNB2392364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a66064ddc2c6969872a877d9267f18e8c3eca4383f575c12bd0b2ef8e22abf. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6M2341153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa792cab959d5e73beaa3ab04f6c7faa421bd85288e34d5c5fe96130d0d7fc5e3. 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/QZK6J2304162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea0da26e1b9c16d0c33095f1b43ba3900adc2636bd109f9d10086ac020a83dc. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZFYX2486669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ea76c458c9d9d11e141ad5a1c7174c325e0a85d6bcdcab285a54b07072a0e1. 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/QZFYY2405875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d2276754fd327b583606f483a7a6b60979c71ae02b5620fed7338b5ed38a15. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZFZ42454042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2753118516732c04097f3037eb865bf63bcf223f3bc3787b190580beaad8abfa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ42454653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102c37af4ba1c13186a259b85a3e41aa333b846f0b8b4ce848131d1d38380ea6. 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/QZFZ42454801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6d9e38058715545895050f0884e76f119fc82e4e0d06728d336d6ed7d39569. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZFZ42454862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70a50606d638682cca0092cf869733d5aa0db26ce1ed8816759765d82273d6f. 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/QZFZ42455202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1296e3fd77f2ffb8a0c2fece95e6d2f802f079ae5bfb1b1679f672bcab79738. 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/QZRP42445273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72407ad262402bfa9c1a5a6dbe68cc5ae17306a60db5a236e880957eadf65327. 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/QZRP42446473.