The Osdorp Posse, founded in Amsterdam, Netherlands, in 1989, was the first group to make rap music in Dutch. All four members are related to each other. Influenced by gangsta rap, they made a name fo
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 0xd175db07fe67a1cd3ef1465d074e75e3e28f089ad893b51c8f7a621ff83c5118. 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/6612c470-4f9a-4ba8-bfd6-9d09b9563821.json and https://artists.proofprofile.net/proofs/artist/6612c470-4f9a-4ba8-bfd6-9d09b9563821.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 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 0xa8086920dc67b4ecc31fa4bf566ac83812fe2f84d5fe564842d7bb1acdad10ca. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:45:38Z), 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/NLAX79302327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd5d9a1ab35dc27e4b32112aead0eded519e82e9969208e0fe456eafecc18ab. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/NLAX79302333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0f652df6bb3f7e3da0ccb2517e3e799bce71ac6ee37f9416514d45ba686283. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:34:40Z), 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/NLAX79302336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f1565437075316edf8d4acb8477808c52645075d161de4d59991ea14b5855a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLAR20925413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd07434ec30b7760dc3c4185bdf46d14d31c07fae7700fe4e3faf4a521bd999d. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/NLAR20925414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba2474175e5a0f92db86586b127c91e591973c2485eae58e7aae914f4948859. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLAR20925415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543e3c771f9b93ac0c20e914265ad5a75d451b176797adbe1e6ca1bec1f36441. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLAR20925419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4003e42e922bb2845f7efb9941d372846576dd954d9372b46259eb3695af663c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLAR20925420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5eb3d49a50dc6067e0215e53ebe2f53119803dfddb7e271ad82b2deebd04f5f. 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/NLAX79602524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2875e6a45290aa263816dbdd5fd0914059549f8acafda8ec2922cdf5e2aeda04. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLAX79602528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb681b40ff277c537f47cbfdd9203e83f0541c40e16036802d13737f610227ac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLAX79602526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946cd862235d9e1fff54885df70bbe1b67bf9f7ddb01cf0ae0636a22c941a92e. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:39:34Z), 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/NLAX79702650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b419baf6dfb609b81bcad7cd19dca10ce72a700ea7c31a4a15129b2b658216. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLAX79702655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a917a90d2b0baa9c471187be8fe302d1ae69f63565f73956311731fc9a6f7ec. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/NLHR51130142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6643d5bb5164fb9d8036fd81d5a219c239fd3ab006b0c2010e7020a84a23ec. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLHR51130129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49ddc1f0fca905cec6914792aa9d3ffc05d488a3b1bb76129967dd102653c28. 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/NLHR51130538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060c54b435cdc398493eb3f566d1ff2443ba09b954d2e26d9bd15bb6400a16a9. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:47:48Z), 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/NLHR51130544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8e5cc6d08dee081bf50ab317c7030ca7d64e5835e31382ce1b02f7d8f46621. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:01:00Z), 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/NLAR20811714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde717f72ad4065eab3b96357e0ff01c4a5c9557034369ea1e7c07725874d76d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLAR20811742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7af60ca221dc078a33972b24e9878e33a785637bb62fcc74c0518645eabcb64. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/NLAR20925429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97e516991f6c30538aa77b1724e5014c9056144dfbaaf97d56d2a0f92c820a0. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/NLAX79202295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abfff2fc0e50f28c223e0b82379be667a57a34ef92e8526c1bf63ca5a8ad44e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLAX79302340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7527931779563d009c14193f3ce54f75923bb1ff714217652eaf94b59b0c6fde. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/NLAX71170888.