thumb|Halfdan E. Halfdan E (Halfdan E Nielsen, born November 21, 1965) is a Danish film composer. His work has won two Danish Grammy Awards and three Danish Robert Awards. His music for the television
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 0x69c3df86d8f9c845a80b0950b4d7f337fc65d07f5ee58cdd40ddaa6ebead8ac4. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66ecb4d3-e4b5-458e-8306-508791b3b3e3.json and https://artists.proofprofile.net/proofs/artist/66ecb4d3-e4b5-458e-8306-508791b3b3e3.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 0xe8cfbc65a57552b9538a8cd9ce25d2b70fddd35cff2051e1d0062d890c6afa39. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/DKBR20900701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e9d1e5a10e8141278acbe0f9defd342b49fd1bce5b3e5e1fb8beb0ef9afa10. 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/DKBR20900702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868e2e05cb3c48fab0c5d24e995d39d195dc92b5aeb236fa3b267b009e404e8c. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DKBR20900703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f645113042c2a2b79f92015c3638ae1374c5c0785a3135e4e4756285906c4db. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKBR20900704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526b0fc59576cdfebb5ac8a5fd1a55c228d5728a6ec45b84f7f2a88ee55979fd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKBR20900706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddd860399bea5217ddb221378529f342b0efaed2678c45a6a4362daea986836. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DKBR20900707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893bf96ec413dc8406d1c1a15970a7ea6509f0c4e121af5b2cc3092c47457295. 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/DKBR20900708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644c5109112c5b65d639c2da1fbb3c6f048ba7da5e6209adcb6f236473f8322c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKBR20900709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9da44bfac6a315af12afe41cb47f74a68707614d3ea23efa60a42b06622278. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DKBR20900710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd186c68c35f3427f7ee5f219e427b0dd9fefd51caf519e64a7cbd059048af326. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DKBR20900711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc6f59fc4a79e947a497db519cf3e33882e521b8750650bc3dea18202c449a2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DKBR20900712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbeceb2d9b35add199636146c011f873431928362b08c4e9292b049ad1433eb7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DKBR20900714.
Her Er Et Budskab Baggrunden Til En Succes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c705fa8719d4193b9d5994adc3f6a1b063336c74d4ff1b267c3144e3be117cc. 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/DKBR20900715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513ba8d0c70fa87ab51e4a521a8bf9d4ec20254bc1abcb728a590cc79006d606. 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/DKBR20900716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43dcd0fd2c4db2888e75a7e457d58049809fffd56ed46eec1e9a58e37a07e54. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKKN31300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0f83efa74bd9ab5c1c19decf229d263a6414089fa301abb924fde892e46d9f. 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/DKKN31300102.
A Tribute to the Everyday Things (Dan Turèll & Halfdan E Meets Thomas E. Kennedy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa05d1328f7e39e7be4658832037fb5c2eeece86096ec7bddcce855ead63f6c3. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DK1J31300101.