thumb|Johan de Meij Johannes Abraham "Johan" de Meij (; born November 23, 1953 in Voorburg) is a Dutch conductor, trombonist, and composer, best known for his Symphony No. 1 for wind ensemble, nickna
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 0xe88e95a886dc31b21a39db45eac6a742d3c874f90bc7276132a493b5ac585846. 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/533513c5-c92d-4e90-b6cd-5157549e7629.json and https://artists.proofprofile.net/proofs/artist/533513c5-c92d-4e90-b6cd-5157549e7629.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 0x3d724403ddcf6b85fbae1a91842409e51721a0cefccf12422314ca15b54550f2. 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/NLC359703401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5790f0583894dc4c5233a4d6ccc3c907d4727321d105aef0c1c879f5c9f9bfb1. 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/NLC359703403.
Symphony No. 1 The Lord of the Rings: III. Gollum Sméagol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3202bb4f6b588f07fad52530650634aa33e810915f549725865b4e4eeaad976e. 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/NLC359703406.
Symphony No. 1 The Lord of the Rings: IV. Journey in the Dark
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e1ff15fb6899180255fa1b9ddd5cd71a4beba2e08fcd042ee47f221805cc28. 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/NLC359703407.
Symphony No. 1 The Lord of the Rings: V. Hobbits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28db7545c61101bc2826fc1aff78847dae19f79f2d73e98cdb3e0db38df5de49. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLC359703408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc1646ead6dfa778c5f7db0784c5cbcd95d90b81fe9ce1e632eff6163763467. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLC359703402.
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
Symphony No. 1 The Lord of the Rings: I. Gandalf the Wizard
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98744e8bd47e8626c704571d3b248ab6c0da2c3fe279909552c457ba693aba3f. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLC359703404.
Symphony No. 1 The Lord of the Rings: II. Lothlorièn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a178922a85a6d5d58af0c55406c460df0d6386e738cfb7ade5f31baecf06859. 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/NLC359703405.
De Meij: Symphony No. 1 "The Lord of the Rings"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c19dbe3da101d5e5636aaae8ec6a834de617550a6b0bdee6362b51f3094477. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAAZ1141516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bfe8ae67ef0a1fe7bcdb53cd33d732ec9de7f947b5d531738d4a20920c845f1. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T10:01:30Z), 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/TCAAZ1141549.
Journey In the Dark (The Mines Fo Moria-The Bridge of Khazad-Dûm)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce346e38e0063469ab393f9903db97f8903815fd17e28b61a8e99a5a7130b822. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/TCAAZ1141609.
March from Jazz Suite No. 2 Dmitri Shostakovich/johan De Meij
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99d81931524eec1d116383c8cc0351272e22cb3aa9cf3cfca743a4d7233eca8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCABE1239287.
Dance No. I from Jazz Suite No. 2 Dmitri Shostakovich/johan De Meij
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd91e1d5c1eb11bc457cbf4c15d11904c7002f3bb4d9e9d061642467d1bf057d. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/TCABE1239307.
Jig (from "St. Pauls Suite") Gustav Holst/johan De Meij
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeec28a2e0518a29ecfe46ea404e731e33b4f49089522845c76f6343b1488aa3. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCABE1239346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a94fac962dff86bfd39a381d1f0ee9d92eb9d2cef31220c21407d5f215e86d. 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/NLC350714402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316bb8816e864e3d7a7cc72048e3c5bb4c7f9434fe2c7929981636bb875f7f94. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCABM1344343.
Symphony No. 1, "The Lord of the Rings": V. Hobbits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f111993f16d1beca9a8153e9eb5133b490798b77e489b056ff221611ae9674. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKI191257705.
De Meij: Symphony No. 1, "The Lord of the Rings" / Dukas: The Sorcerer's Apprentice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ec16cb708b95102262f653bd714985e0c2563f45fdcc4fc554f2fa2492a29f. 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/NOCJB1800114.