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 0x7e694c8476879d5d7b042a95f7f8eb7975d2699d49ff5dd49cfccd9d144f526b. 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/e1d65e20-18e1-4e48-a62a-830378d04e42.json and https://artists.proofprofile.net/proofs/artist/e1d65e20-18e1-4e48-a62a-830378d04e42.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Liedjes op schoot: Zing en doe mee, Deel 2
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 0x5e1e01532028030c18934bb2ee927306ebf3546bf7a0a341f2f54a3bac2dc733. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/NLG620498961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5878bc11b05b5af4124d58eb8e820f36df8bfa800b1fe4851dd2a8f463eecd83. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NLG620498962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37f4de869ce5ff235e855d4c2d9623394bec90850f78d342ed93c07d1e07316. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/NLG620498964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9557b701090e8ab16ecc2413cf81c05f3c78644d99267122562fb39cb2b81add. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NLG620498965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d265f86305c427a8e0f914aa37817e0e6848a911ebcfff401cbd4cd9bff757. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:56:49Z), 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/NLG620498966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627eff0cba27e5e182b9de9a7eefecc58578f4d511c89293ae7bc899100f68b2. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/NLG620498967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a66d5fc0efb9bd85cd5ac7a46560369e8071dc24b40faf085f7643560adbcf2. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:02:51Z), 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/NLG620498973.
Medley: Timpe tampe tovenaar/De olifant/De krokodil/Spinnetje/Poesje mauw/Hondje waf/ Timpe tampe tovenaar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7770ac28d0d3d564683fdf9bc628fbe1d5c59feadf0b4c5fe2addafb1c3b9e1. 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/NLG620498982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6332270888c0afa18c8014f09d0b8f33a13132869e47fc648cd8ff22c7f49b4. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/NLG620498988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd686626ba94c054e3a7957cb57fb202de3a292f6c9f3adbc114c7a7b276c542b. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/NLG620498991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f8d4916f968d6b34b7f8e2b7ef6709ac8e5256d144b5d5d362e95699cf0a9c. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/NLG620498995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424d1fd3a150ab65e80e97a36e877b956128cff0fb1ad5b571f7238237995ffa. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLG620498997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65498ca52db5a20b04d5b64ad05e053d7e751e7cbcad0f013779b515c25f9d96. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T04:59:48Z), 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/NLG620498998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5225828209f56ed18ac598791e6c5657925fa2c53ccf1414db906917f399911c. 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/NLG620499000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89d813a718a915b58b88dd4d4f3c4ce74f7e4d226f1319fbd0d991d5164d80f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:05:37Z), 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/NLG620499002.
Liedjes op schoot: Zing en doe mee, Deel 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3316ae751d5e31582b03f5748a1f73811a1ff00a660c3c790a4a4f696a2be7d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/NLG620498915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4307ef88c1ccd8da5d686ca7b0524dc96dd8ad28b545a3845a02115f94c10172. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLG620498919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1ea662888d8f71b416f4ccee6cb8804dabf9486584b06e5016960cbdd2a58d. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T12:33:42Z), 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/NLG620498921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aa7c8410af009ef7866de45f695bd1743de3730a80f07845a55cd083424f35. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/NLG620498930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8a5bcd99c7b3aa7b9c46eab6932a63a285d6a5eb88727c62165157d4f67b03. 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/NLG620498936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6552d36f80502ccc94947803c51c1cc6a0d30ac8e3659a0e9fe9453d366bac93. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NLG620498953.
Neushoorn (Rinus Nationale Voorleesdagen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124c031810b7177b3e29346da605dc92e3066995931ba11e95c2048fa6bb4286. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ7P2437254.
Ik maak muziek (Klappen klappen klappen)