Ulla Pia Nielsen (17 February 1945 – 22 August 2020), known simply as Ulla Pia, was a Danish singer, best known internationally for her participation in the 1966 Eurovision Song Contest. Ulla Pia was
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 0x9743e3dfbeabde68fe04d191ec630c440c3d6d0dd03cbddfcb4dc2650ffe1f22. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f74ba2bc-ce3d-47e6-81f7-8f88f64dc480.json and https://artists.proofprofile.net/proofs/artist/f74ba2bc-ce3d-47e6-81f7-8f88f64dc480.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 0xff14ec8198bc24f2d5a24bedc18b09839e877f299a811fe1016ff1289c48d7c2. 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/DKABA0600248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5fe466343eb7a4b163a60337499467f30ade05744ec05f0ee30850e984bdde. 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/DKABA0600266.
Både med og uden - 2006 Remastered Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92f36cbded28ad4f2a48591d80d7280ead8b68910db1feb53b20a3bcc1916b7. 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/DKABA0600268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1944c50ab3449faeb07e7dee46b9a551419fba5b0ccd1a1ada688eeb8b2741e0. 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/DKASB9900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c9e57e46f161fd1a1e70811f8d05299deae83a83f00b4f01369863e3a12c2a. 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/DKABA0701854.
Flower Power Tøj [Det Bedste Af Det Bedste]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1944c50ab3449faeb07e7dee46b9a551419fba5b0ccd1a1ada688eeb8b2741e0. 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/DKASB9900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93d71f98fca08a45179527d44fb4c32ddf548288cf8ac87dee670563f263a55. 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/DKASB9900202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7ffb68e921254657a9ae3a2429e6fdf4235ba62f8cb65887e59c712cfb20b9. 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/DKASB9900203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f93554dbfe51aec49ac49c528a80d8c063f988a5a2bf8b09b217ca5e4b01629. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DKASB9900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d683296b695533fbcafad8c0d95f6884d246d1c4242c968a14270ca01eb8042. 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/DKASB9900205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38471b108de3440266b4e29e3e732a1ae26e69cb01a585eda705ecd74624c11. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DKABA0900359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeadb159012dc5530b9f81d6568ba1ccc3c26baa567446a3f3c14fa60b9f4a9fc. 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/DKABA0900360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6731aae857db87f832a53ac7dc77d53f863a690eb45e9c4a96b19050b86ed76b. 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/DKASB9900410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0479a5e6ee9874c662d206b0cd1c653cf98d94cd9517e55c6dfe7530bba09774. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DKABA0600260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85956880a75c92ba1104483a03bee8449c71de23534e2dc18f867c7756937fb9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DKASB9900212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff14ec8198bc24f2d5a24bedc18b09839e877f299a811fe1016ff1289c48d7c2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DKABA0600248.