Willem Rogier van Otterloo (11 December 1941 – 29 January 1988) was a Dutch composer and conductor. Biography Van Otterloo was the eldest son of the conductor Willem van Otterloo, and was born in Bil
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 0x9fcfcba433f035e47ded6f7cdf003dc8ed24c8bb1397c6863fcd9988f28a4dbc. 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/ad5676f0-81a1-4501-85bc-c580f451dfa0.json and https://artists.proofprofile.net/proofs/artist/ad5676f0-81a1-4501-85bc-c580f451dfa0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Movie Tunes That Should (not) Be Played on a Tuba
You Got a Friend in Me (From 'Toy Story')
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 0xcb0101217d00cccbe767a15f1506dc40c7e1811b5d4eb00b7a998f5afcc58429. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLHR52101234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e15f954e7c8f92e4a761903260ba2a9a6b97a3f50b37cd57f142defe61f135. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLD017811003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c26c74411d97a74192a291e7d71a5d86f07dc1e201f81089d0c83e530933a69. 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/NLD017319001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd553e06d707b1c1f9aa3580c45a5f5100c7883c64e50e3d25045b291ca55d6c4. 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/NLD010300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8912f9e38886758237aa5eb704ccf0a90de9dc498abdceedae0a18f076961924. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLD015511003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9449a3bf6979ba0dd9f2989c2b742bbf562853cee561b77311f26b5e5dfd9532. 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/USPM19800477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d6d00ea5058b84cf5db980d5db36fb03409b29eab27fe20517c61b12ba27ea. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLD015511005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc36c35496087538c56b72874cacb5bb937f3b25e0497b03e16434d8efdf217. 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/NLD017419002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b888506904b729764115b64a13fb51d4a47adcfa4f4ae3ebe9c0b6b14535c9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLD015511008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2671969eab5a2b37bcb89ddc38f770c2fd03134d674c25d5abf764966d25239. 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/NLD017302012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee16084462a590be685b4fdb7a4516db7e0623c01ee095fc7b30c328af4c8bc0. 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/NLD017302013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d23b89b9bcf0c1f95d969cb0a31cab709cee834aa249b5ce0947f3d172fd771. 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/NLD017302014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30c8939e9edb68d218701f9d8b03081220a0c9e461f1566bf211c2d67d8c53f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLD017302015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5206e8cb7dd43cc74ded9c32c7a8be5e8a7fcf842478dff7b5cdae5f92d082ef. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLD017302016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf335d231e74f457c6a7593e811263fc7d875d847427c8781c148383a9260d7. 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/NLD017302017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c26c74411d97a74192a291e7d71a5d86f07dc1e201f81089d0c83e530933a69. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLD017319001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e657c51ce2935bdea11fae2aad9c1510fb5bb6c3b8e419e8b90c92106e7f34. 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/NLD017302018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe610051a2316b52f883f0f3750e9a3653c28868c8613b2c6273cc2cfa98c661d. 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/NLD017302019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d6d00ea5058b84cf5db980d5db36fb03409b29eab27fe20517c61b12ba27ea. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLD015511005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b888506904b729764115b64a13fb51d4a47adcfa4f4ae3ebe9c0b6b14535c9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLD015511008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997bdf80d4798912ef0715e9a06eaf8420a23e00cf740ee96bc5893378ebccf2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLQ701400231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa559c22cd5b91aa47bf172217dfbd325c299b2a4bc5c4b14c6fdd82e7a804c6a. 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/NLL6R1600635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d53b0e0d2d67ba09c36efea2c0802f41865a11e67f250ab08baa31251cf1189. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLL6R1600638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100ac9c15156f65cc1955d7ff77e247319a4c022dfe75d448147f37f36ca5892. 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/NLL6R1600640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ec1db6b4de6a73d274cb03479cce1952b95dee868fa783b7a1002f8a58cfb7. 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/USA2P2040313.
Rodolfo Matulich & Orchestra Classica di Alessandria diretta da Renato Serio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2017f71575c502d850f78ecc5b82542d7b1d977671ca9065286ae65cd48876. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA2P2040327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd969a9ebcc8e193c681f0af762e9d4b4feac562383cea50d4f20a4560d6ca274. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA2P2040311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d7bbfb0170eeb2df830cd3c3e6d545b10b014ce051462908bb26e6b25ccff0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SEYOK1505301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c7a95fe0c29e93e14edc6fcc9dd7c2af74890092871c1ec43e8a7ce89b21af. 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/SEYOK1505309.
Vlaanderen Leeft, Een Verzameling Hits 2