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 0xb879ae407188f6e98c87e95b29992463e0be456d786ab8862f61738038d0432e. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cff39e69-d0d6-4fa6-97f1-177bffb6dffa.json and https://artists.proofprofile.net/proofs/artist/cff39e69-d0d6-4fa6-97f1-177bffb6dffa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hervormde Gemengde Zangvereniging "Vox Jubilans" Waddinxveen
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 0x31ffb8baf2ff60eb90f7d0f3ce27cbb52562ce7595304e195f068c5b67224179. 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/NLCQ61741401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782c5b9be2db5562c0c4705bb0ca4e901f7e6f43843bb40e525024776e875374. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLCQ61741402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7590389fd28f77845e4238689bac376519d79d90a451e04fbecc815311bb44da. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLCQ61741403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1fd25606f18b352b7c8aaaf343338ae3baa35e590a451e3dfe85af141419bd. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLCQ61741404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef740217c2eb6d1e9a65509e53027223165198fcd760d038c68a5675f4d84fc. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/NLCQ61741405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04b5a7f6d78ef4d00e14251e4ccb14689dea617d90e543b28d9816f3ac39f9d. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/NLCQ61741406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbc060ad3b30ad70cc2037c108402e687921982efbee45b00dab56b6e3a3a5e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLCQ61741407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e4982303047cc34cfe440e5306a5619d108d742100df9f4cb5e6d009691c2f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLCQ61741408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d81b4e92909ed3a843b4e5a494fd6789328859de46b91de1fe588ab5e8f406. 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/NLCQ61741409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c614b118814b244662322bb59dbb97a7a6376ecbac2c908748c11c0e3a27b7a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLCQ61741410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83f83f69ed5d6cb07c8b048903b30e44a75f7bc786a5b6410c52f20774e008d. 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/NLCQ61741411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5fd6856041a4e9bf7be2661b5400440c8c1d92b5d8e7b3941ffe65e7031f74. 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/NLCQ61741412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d9950d87d28981a3d038acffe84cd17f55013ba4f8272dfd47aaaa10507697. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/NLCQ61741413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456e803bca5b9bf1d8edd334cb1b2cbb3149184a6dc9a9c3db4c2b0aed1d445a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLCQ61741414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5adc649d00ce04db04d23eee73e2d12fc5bb06a6e61d6f3169b127178e1d13. 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/NLCQ61741415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96407c309be50abbefaeb43eb78595fc55ee4c85ae7d701e4ad791a5f3c8164. 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/NLCQ61741416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7829a83c6f7b9893743c9b2327931419b87cdd1c6b14d29a1efb543ec3cbd8c1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLCQ61741417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba9326900cefc08ba4426903840b5b24470fb3cad361980779deeb6b5249003. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLCQ61741418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791a1bbf0c254dcd8a11ac3f763aff9bda708f47895f8baa9edacb539936cc8f. 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/NLCQ61741419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4abfa34b623d81cf12b767d20e3e68075491ae42972818d77a6668952de692e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLCQ61741420.