thumb|right|Halfdan Rasmussen in 1953. Halfdan Wedel Rasmussen (29 January 1915 in Copenhagen – 2 March 2002) was a Danish poet. He was known for his literary nonsense verse for children and his serio
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 0xb5bf8eb327c689332a1845cc0db963f1fd3d3c68cf6dc68b9ae4d8ec463fa6e1. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c30283a2-59d9-4d04-8c25-95eddbd2a5c9.json and https://artists.proofprofile.net/proofs/artist/c30283a2-59d9-4d04-8c25-95eddbd2a5c9.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 0x95fa090b5ecd6a35a25dc27e3ad8b6e43020253286fd961eeab1d846144d15e9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKD2S2300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c54a685f81d78f94a1a15bffcea1c89a047fd8229a9e695770f0808c575a5d7. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DKD2S2300101.
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 0xc0f2a7411ae662e37fee1cd3840d9388ce3607c30c0399dbae5da34bc58ac720. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DKD2S2300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda3a662c800adda6a96d20817a0360a67b3f71f7004cab68e9638201108205a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DKD2S2300109.
28 melodier til Halfdans ABC. Udgave for mindre børn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aba40b41f5b5e760db282300cb1a731b137531e9c32062a249a59d9b9ba428. 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/DKC8O2100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1237e3d33c0e67a3a5e36ef77f62a521cd81816872ac354fe9bf42a00ce79be. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DKC8O2100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca431ff1bf764230db53351db8dd7a1e837031a8e2b6bc2b77f0b5fe711b43f8. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DKC8O2100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d057209e52e6a8f786d5b5e290f6c9631ef3f4b06c7db82d0fc59ebcc5463aa. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DKC8O2100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18bb682dc15adbfd4bc682efea7f62b246783138d6c81f2146e26f1537620bc5. 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/DKC8O2100113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7536b9e49a3bbca769400c969d547bd3b251e64303b0443a010b4571238ba107. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DKC8O2100116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a27afe76423e76d25dbb88ad07e14efee38b71b2136e54587ef757742ade42. 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/DKC8O2100118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccb0dfe26271f76cc8bbfad88fb097b49182dec0df199c0a5d056c74560276d. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DKC8O2100119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc64f7a2e7e182a2fff3db5bc9e757dbd1e28afcf14c37a32949a782c8433e12. 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/DKC8O2100123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826f9343eb50c5293359b2dba8f99ce5748cde7b5ab80a67087270d8f70c1cf0. 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/DKC8O2100125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db20350eb629727e3527d9d69c81a8471e90717431ac5e55412c68c23e85f6e. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/DKC8O2100127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7aca492db3d2b285dc80818f9090d30787b4ba1b9bdc650a4a4549f6837838. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DKC8O2100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f8647dfc3e8933e4d65b3cef01fa0429da505fe9f14442d3e6d0d839d8691f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:03:23Z), 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/DKC8O2100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3131a5a658ffbb3e4de194830fe3a77a91b424ae83c10f04ed7dff67543ca9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:07:15Z), 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/DKC8O2100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf5d088a46f05c02cafea0ac90cc03696e743ad94619cdc3c2edef3b6b23d1a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DKC8O2100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448112987d7c05a5157a63f69a364b3acf922d396b14453fd37fd78a1f029bb9. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DKC8O2100115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17e52a4f5da37abf19f2f3d369f8c9366560bdf6db0678bbcb1108d9bd5c2d5. 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/DKC8O2100110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd281453d1e8397fbed629b26aeb917db0c4ccd892c513e15319c1cda8b3a084f. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DKC8O2100120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c980d80f88e3234ff1d7851327fa5c702e07af1b1f0849a29e174f1ee37533b. 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/DKC8O2100121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1790fbd85e52638fe658ebd80401fafcb0bea3566044d9966eef61c340c70a. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/DKC8O2100122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50c7fe7dd74d4ccf515648f8e70431180bc2f769d344ca0ecc4dce48ca6fded. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DKC8O2100124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0907166aa8b528ed13616aea4956437eab210b75b74d4faf12a2b8b801f353. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DKC8O2100126.
Malene Schwartz synger Poul Henningsen og Halfdan Rasmussen
Halfdan - Klaverakkompagnement til fællessang