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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9580b4a344f41ef609849fc1786515fe78ce2616b70c865cec3ba0b554edd9. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d53f0a14-c310-4f77-9f62-740c2c25f16a.json and https://artists.proofprofile.net/proofs/artist/d53f0a14-c310-4f77-9f62-740c2c25f16a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec2f47b1203d978af0ecb599f21aadfc1441f737f963b458b287a4b18bf8587. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLD681302012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bff47d08419d933ab44629882be64657fefa9b2ba0b409ec88873e8ae61b078. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/NLD681302013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec56a893b1a92954aae100189ec6e5756057fba8a9c834814a4fd2e8efaf49a5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLD681302017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596ceddf99a4405a0f3cee75950e02b06a665d3004086c9106c120c272b7d6cb. 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/NLD681302021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d22db19abf918db2bc29a6a25436efc8afaad64d4c897678fdeae562ec5df6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLD681302022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6434a51d7e580c6fe74812b7c6b06e2560a1abec50e18345f831f05f65deac61. 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/NLD681302023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231c62b732c321bf88793308c48423ab1a0cb74fcb90b6bcad2dae9c330801b0. 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/NLD681302024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5670564a70affbbb6217fe80522c2c61d2e7b12a8228f0840a3f40cf3890f280. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLD681302025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe828f5555efbe3909382bf8ec6b6e95386a3581d9356e1b63f7b126236542bd4. 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/NLD681302026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d8e9b56a07ecf0668320f716771787ca77d4eb468c13dfd6b7b32af4a1d21e. 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/NLD681302028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e819ec0e1c668d33f168e2f8ae1ce77ea202e15f5522c443e48640681b2aa4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLD681302029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41128312259b321cae09c0328a8e61f64818cfa565e9d7fba94e1b4848aa5be7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLD681302030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17874c6119fc6f618c5fcb1d23286948bd56cf8985f7da646500c6e530f83906. 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/NLD681302014.
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 0x1bc1a5fc7617adb5042fb256cd70c354a8ffa81ade981429768d0eb444f8d79d. 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/NLD681302015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662a04fdcbeb31426c6e35fe44e8a434fdc4b327947c0a0c882325b172a10d7f. 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/NLD681302016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a47080d497ca9c3f9ece8a6681e36a79f475ea165230e9198fd526ae522bf4d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLD681302018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2560f39a583c8e06eb79196c800148d004b0abd44fa3c961ba17d5d8178fe29. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLD681302019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ae0fd568e93d4220c60da171a3e47de0b3d4efd4008b1e4371761a678b0b57. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLD681302020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c25cb327c901ffd05c429696707427783e8d2c48d86aea7c1433db561697e68. 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/NLD681302027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f4f404aac69443c1bf97c86b2bd385fe1a97ae1c1e938d95987f87320e2de3. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLD681302031.
Als g' in nood gezeten (Bekende koren van Martin Mans en Wim Magré zingen de mooiste liederen van Johannes de Heer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdfde262c37b0271169dfc9cfeec2fccdab8e642e73eab67f4e6352b3317ed0. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/NLL6R1600141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4fcb67c034ac2cf9726a3a462fb7fe63a28072c30a535aa25d52c8c347c803. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLL6R1600142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0d559d1d5b91ee841ad9d38f48644771129dad44a642cbb5848b30ffa03414. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLL6R1600143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf27e09d0e1259ab99001fca54e562cbc13c335a7d1c924458f34b559d3a6654. 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/NLL6R1600144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aef328eace3b1c9cf5e1ce8ca24e9384a4c4bb49470ee0d935ab67e6f7e363. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLL6R1600145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae27bd02c582f1ad6d30163e5946ead839a711128a3ce57a0a648499f3a4462. 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/NLL6R1600146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de8365abd5378c7d0e67c06bc2d49772631eea679270dfe377f2fe21c182d4e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:19:51Z), 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/NLL6R1600147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe167516bd06d2d2afe456f34fc4083a65a3e7480f9569b32e4f96215931897cc. 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/NLL6R1600149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545ff844e53e6c81a1f4b52c03fbc22e0332379651ba1e2f1e34bd4e1975fda0. 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/NLL6R1600150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3b6ca1360ec6deeaefbb524254ddf9ca65e05cf485dfbf47187eac56e635c9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLL6R1600151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6e2e353c9c13418efa5dae86b914389ecc6a269e23475966cf2cb7b1593dbb. 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/NLL6R1600152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051cf6793e8c524d4f2e8b9ed5566d80e11334ddb9fc36598439195ba0933019. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:06:50Z), 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/NLL6R1600153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7dd53f7b21bda2c73dac5cdbeae3405c271348b6a2c2b133e08419d43750863. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLL6R1600154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73a904586f602d272127c8c5f763a36b96cb5a6bbf977bd15d1d9614dc69c7c. 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/NLL6R1600155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9431ca8f9f07f4092376ed25d32e5e2629cb6683625ba6f4702daf3f2afe326. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NLL6R1600156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c12a947e1c0f04ffef45493248356469636f65c975dba5b255aa714c3767c21. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLL6R1600157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee261a61d0550f9ba948f571cc5de85e4f67fef1b73525cec9d265a132bbea14. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLL6R1600158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535f02ec0cbd75eb4f8c0165e56dc4f7b723d646cca388b1c1a8878e69e2a871. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/NLL6R1600148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f82b5e98cfc9dcf8c2ecd43027a52580ad3551817e624cd220c050620b8e1f. 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/NLL6R1600159.