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 0x26c08bb395171204e934dc79e1f51f34b75fee4a2f25af8e24ad868781a695c9. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f33027f9-a5c1-4ff4-9095-b8bb24f3040d.json and https://artists.proofprofile.net/proofs/artist/f33027f9-a5c1-4ff4-9095-b8bb24f3040d.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 0x3b0fce0b0229ed9e3717a4fd96f3e7dd281d80dd9e7dac661c67c197a2f4ed38. 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/QZFYZ2277418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058c82481c6658da9696fd2f81bb410fababbd3b6ba411065cb5e18d534ab3a2. 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/AUA002200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6478a74cfff085b6006a1b12e7363abc8387d706efdd2a119dd31c26cdc067ac. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZFYX2180173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed64da7afb825e9a2c301f3fa28d15445f26aa22009e930e88143b3d3d870ca2. 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/AUK3X2301551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa090b4c80db5fbf52088d38b3784b8487570230f02a94f330fb37bc7399f6c4b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTBA2442204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cbd53971b5cdfe10d781142ce716cf4f1ce390c50ac8db9ed89354ce358aaa. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFZ22418658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df0b598e4d2e989ebffb8c75ec77104e9825b525d8deccc03fd3458899013d0. 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/QZFZ22418659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd406d41df92eeb414eedaf31fe074e553b755be455938f2f8b807dc3b43abab0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZFZ22418661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a18d356aec4834948c11e154da6eb342d1522057ebd8202384a63436660b9c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFZ22418663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741d21b79c427149251187e42264fff201a8ae33d698cd0151ef1542ebb69969. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZFZ22418664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00bc7be363b4a9419c8814e6a0d02e765412dcd19323ed9e9cfa0e6bde3a16b. 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/QZFZ22443779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85de372387c9aba9db12f4a0efa7999967634ab0fd75e407e225f02afbce53a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZNWW2350512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441a8168e305bad1b254ea599e610451bd1c33f1ede2e5f5a03bf233758e1e29. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZNWW2350518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54981f77a5c486700ac338b8a7f4cb3f2d96aee8c77b97937ad18a9f1b3b837a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZK6F2255183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640a8fdae839dc6be1f4569c620fad73be96da2e658bf742df47fb8ca57de3c8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZK6F2255184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67ddbaf2f04c87213911c813136eae64bc35950e1de934440ca11286d8e12bd. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZK6F2255185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b02902705df56cbfbdedc6f5c24db819bd33c0f8c7e985862e15a02db3b1e0c. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZK6F2255187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2020a67d4d804bae78cc62bc8453656b044c56991f63f3f66aadf2e940137cba. 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/QZK6F2255188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8753a1b4cbde03440c1952d72255db9b7a1eb612d9d767fafa97bd09e19718. 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/QZWFQ2450110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739b6ac6d7e7460b86c68402e482a9e6cfce67af16d92f70fe041e3bd4ab1a2b. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/QZWFQ2450111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9622d01a04187f43eb9f234a3e05644d7046ec72d8cd8f69703a53a25620c3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZWFQ2450113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed7cd1e205a1ccd13f3d12d06231cc694cd0de3d1d0bb6d30868a8fe34246fb. 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/QZWFQ2450114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb243e1727066ef4ed8d6ccb551ec45e1a41a648d732bce3729d9f25c110eed. 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/QZWFQ2450117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b5b36b4ae82513ebe1c34a63d4955dcc57526aa09b743a1dfb2909f817e9c1. 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/QZWFQ2450118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd3a9db8ac5755d6a092a4a9f6d231d379a1557b00c9708ae1fb4fcc6775a73. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZWFV2474882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74fa4a22ed951b86d24a6abaa8c36ac064f521247fe58eabf17ea2db59742ec. 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/QZWFV2474885.