thumb|Ronald Snijders Ronald Snijders (born April 8, 1951) is a Dutch jazz musician and author of Surinamese origin. The flute is his main instrument. Biography Snijders was born in Paramaribo as s
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 0x13a916bd441f7048260b9102e9bf6e54c52318d16372d3a7ac07e3c875dcfe39. 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/06e328bd-d10a-43d3-9a28-1b95d423fb3d.json and https://artists.proofprofile.net/proofs/artist/06e328bd-d10a-43d3-9a28-1b95d423fb3d.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 0x9d54ffa841b3f286f53d8626c5a121b708cb75a92d6b7f88c21fdbfbe503de8d. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/NLD321300986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf84b6ca90904b090287dcb39b7faffdf6eb6cf184caa1016f50d61095df56f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NLD321800478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434aa4cbebaa33fa34ff53af6ea0c80b2f596dee26b187513f0cd88ea88a2fa0. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/NLD321800486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93051ae011892290fbcc71d1b9a3d3938500e8c475ef1a536ee8583e6d523011. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/NLD321800487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc07cbd1f0eb020b3cf9ff88687c6c2accdbad8a06689938721ef68b669b7b06. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NLD321800515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99698f1587ad1a6c8a98cf29a30dc6429a5b30745d0dafbd2efd87bc5fbb0e57. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/NLD321800491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e7a23d087f44d4abe8421361ac614ce355856ee2ca644881f1f01ba3ac152a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLD321800492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5689ad90e5c63f31ae9086b52a7be31bf298a678cf9ee65607e282fec8a25a19. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NLD322000187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7555e1efb6c6c80555c4feffd39b2133748149684da5d22a65b136549cced8d1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T03:42:15Z), 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/NLD322000195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4699cdfe1fef1ac3eef2e2e0d30278fed975f0ece625f05553bf2c43e497c312. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLD322000200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab3bae9ecf72a481e0280732e54b1bde30c539cc812447e51b17503d28dea5b. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLD322500164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9baf284f8f8e36c6f677d77dad916aab9680788d5f587aabbfe5977f9789cc9. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NLD322500165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935243e32cd8f8916b53d74fbd0f209a88dcac3f5a7c924e07b4ac32203a3d87. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/NLD322500166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeff6bab259cb1ba51bce757b7f06c7ad668941c6309e48deb5dca5a98021472. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NLD322500168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44329323cd99ea07e7a7c28af3d99fa2be5e1fdf182046ad8b864f68db513e67. 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/NLD322500170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd132ba71d1826ff9be62a580bf00ae2ef57fce4fc2e6ef478753872bbce1fa23. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLD322500172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad706b98be3e4c57228474bdf938e99c2e578148628d506f0d72f805632a8092. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/NLD322500173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27cc39af58ccc92f7ceeff62236f6bf860cc2aeb7682cdbb1c14ee2169988e0. 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/NLD322500174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67de6ef3bc74ad4e9033e5f23469636ccb1cceac9be50b35d8196002934be417. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLD322500175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522d986355ae87f09a59d5a12ec6f337c82c553068638523922a0b357a4a7e9d. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T05:52:46Z), 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/NLD322500176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c83b256d883f6c181b475eee671f4ed605bb3a01b368f3db691ece3e2bdc1a2. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-20T00:26:51Z), 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/NLD322500177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8906090515d53892569a8d1672b999a33d4ecec46434044ec58893c1447d805. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/NLD322500178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501292b7021e4fb9045374fdb1684da45c272f9951dcd3bf06cd9afc3d60bb23. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NLD322500179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cfab04f8ccf952a5ace46f1228fb0a5a00c115cef8514c76b1c11023d913b2. 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/NLD322500183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc1f603553805bfd20ad73ddef985b3561ff311793b5648024fc572b7d53cf0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLD322500184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70c1643eb222d419709c401fc00d3221bbe5a5743c7949674f6d9f56508b43a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLD322500186.