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 0x643f07d08ccbbf3fda9611ac1f97e550b068595e443aeed7262abcce96c538b7. 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/f58d18a7-08e7-4304-9cc9-e664be00c019.json and https://artists.proofprofile.net/proofs/artist/f58d18a7-08e7-4304-9cc9-e664be00c019.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 0x4efcb9e34fee1a68777fa5c19b3fd110f68cfef306915330e3efe91a868d82c6. 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/CH6541675419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e863a9a88d6cf14361d6fa1c088b27c00945fcdf5de63546a9b1b320e483a8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CH6541894587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5652ac8567b520c6d80509042c9ba2a7812a4348abe17569c18a22306956de6. 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/CH6542083265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5be4d4e722fddfa5bb0ad2f00e6a61446295e284d0ae0a0516ecf42967eba83. 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/QZNWR2247775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88eeb2ba0fc0ade040df62a9f362bf243947c81046919e4df42e9cc014ecfeda. 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/QZDA52320303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb130e02a118eb2605d0b6362f8642ae757afa5810250fa5a05574c530a7e13e. 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/QZTBD2352267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88eeb2ba0fc0ade040df62a9f362bf243947c81046919e4df42e9cc014ecfeda. 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/QZDA52320303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b7a4cb3b272cb389ccd44b9184833a272f4e739ce9a011aa8ab865a6ad693b. 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/QZTBD2352269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13eae570acc9fb70c71afeab21ee0b2b963e317726aca34457c90e049dca48d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFW2406154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b08684580045ae96cdd248dab4ba060459c38efef54be5476d0f36a71faa3d. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZWFW2406157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aaa13fd1123d78e81b2dc6670f0fcc5e928fe504b2874d663fd9b3018d4aa5f. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZZ7P2452228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f044e049b341a1df7a915dc61a525ddcf755e7ba8df66b0e1f80a05ebdb37aa. 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/QT3EZ2479142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ef200db1e0b98f92c9d18bee32f7044cfb8426954301d6fcccc7c89be099b9. 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/QT3EZ2479143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66a378f7dd1ee511d431b9c777014e2de8f1932cbae7ec6d23be9ba9ffc4b2c. 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/QT3EZ2479144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde962570b7b3f875cbc75e7794ee329b4fa09499dfb04cbdaede9214b9f7868. 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/QT3EZ2479145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a879210091c4d6edb74ba2252d84bf67ae2e9752b89da143a4668c0421dbce5. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZES52597559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa45d956e5bc7e40801e0033703b5edf7a42f35178cea414f8170a7baa65db4. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZHN82532021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d687412cf73387bcba04e65ce7997a531ceac012f2383fd71b93fa53a7ad142. 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/QZHN82532022.