David Fonseca (, born on 14 June 1973, in Leiria) is a Portuguese musician, singer-songwriter, and photographer. As a musician, he plays several instruments, including acoustic guitar and organ. He is
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 0x00723873b72844b7fd5b39e510b77c7064fec92e6eb9bdc093db508d58e77402. 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/0d798ee1-fb4c-4c45-b363-87577b4e1704.json and https://artists.proofprofile.net/proofs/artist/0d798ee1-fb4c-4c45-b363-87577b4e1704.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 0x6134a6b33c5a97fcdee3e7d3e97fffacba1843a09e3fb485f036fad7da6c12b5. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/PTUM70500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1253eb02a3bfd9bbc8e9c1a5ac61d913f5190d80a6da15d3768cc12d179dad62. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/PTUM70500011.
Rocket Man (I Think It's Going To Be A Long, Long Time)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219e6e82e5ae5505c059a691b6d6991694e4c9fff1c503f712d1560437627429. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/PTUM70700289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4055d6d7367ec39d8fa183b78cbfcc9c91e594d3d1177ce37d220c4f81c983e1. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/PTUM70700292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3286c6231d2ca0a7be5247297a9012632fde18f5af79076dff3d7a392d647ede. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/PTUM70700293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a2d6064b7d3d5a5c77b5b71b76a56f7e92d0f011b29efc4b89456e60416452. 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/PTUM70900312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dc848261518d8baa82edaabc3b8be63e127cf8507f5441518b25c4958d4de1. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/PTUM71500123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4dfa8f244708dfe19f926c6a65ce79ae12ec039d3c97003bf30a8ad94f2bb9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PTUM71500296.
Absolute Beginners (with Tiago Bettencourt) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3a57faa520ea3571559165439fcfa99d6fc0a5340f807089da6c6020916e76. 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/PTBM11600395.
Modern Love (with Manuela Azevedo) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d09452872afd31b98a352cc3d9bd5f845a86c8c9cb0b0deb0b255597f1b00ed. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PTBM11600396.
Let's Dance (with Afonso Rodrigues) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761b49b867ab14f075b8927fe53b28c3639ed30f76c94b673accdba602a4e35b. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/PTBM11600397.
Life On Mars? (with Antonio Zambujo) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab6be14acfa5c2a085f46e3ead3e916180824c366e78f4dcfab595d6dd96f61. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/PTBM11600398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09454816ba774c0ecd0bddc169fe5b4dfff610015062e118caa26dd5cffb7355. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/PTBM11600399.
Blue Jean (with Catarina Salinas) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912afaf23cada49fd4d01b64077e6d6fc3b801ee2201d5a892551805ac1ede52. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/PTBM11600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f74765849c3b681fb34fc1e72d689d69fa6ee2fd662b476d46cbc12cfe7e39. 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/PTBM11600402.
This Is Not America (with Márcia) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec56be5f229a369230cecd893e40e9ec9f782949670b971169f27ad7d31d229a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PTBM11600403.
The Man Who Sold The World (with Ana Moura) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4609c586d0a080d5e766c9b4cc66011ea1297455536d5ee83336f0d1b43fe613. 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/PTBM11600404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5606618f371599f8a48f523780c470e885718aaffff588f99fe0937fd7822bef. 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/PTBM11600405.
Where Are We Now? (with Rui Reininho) - Bowie 70
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2aed220bec02d4d6b23aeb85e0c9b5e0410dd027de46046b5095dcf7c39ed1. 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/PTBM11600406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18237da8e197ac33e2aa0937d149a0b9bfa9f688852445f0cb79cbf0530cc4e1. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/PTBM11600401.
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 0x5f4ba46e6b2853c845338652493430b2ee5850ace10171ab23375370522283af. 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/PTBM11600407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e92bfbf63328c19d0723f37d887b779bce307979d79778a43bdd3e64efc05b6. 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/PT4FG1800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9056f418ceb0ab90fd740710000b99c4ee71739e85a587ef7e690380cd302e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PT4FG1800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63a3379735084af58e279c7c7f482148e8a51a673eedc3f65fe1987b9f30e9e. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/PT4FG2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22deaade10e48b05db61639f7361906b4827b08ec00d02c50cc9336bcb25793f. 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/PT4FG2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac49262ae1bb614a1017eb71daa2d7ae48461cd44079991bc9d4e0978d3b3e7d. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/PT1KV2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61329e53b6a81b36415f1f6fccd76a97b8aa1a48cf368f02f365ebfa172793c6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/PT1KV2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7370e16c1bc1d4ca04594aae68c38858ee05804a94224a5e8f0f13c265226613. 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/PT1KV2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a0c08e72768563bafe04378b653cd4142a9c30d2aea784c0f3dcbecec11d19. 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/PTEM10300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb599d9f25603c5b25aaf1b9c21274d7944347330d12ae148e7ae6d512bba4339. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/PTBM11700160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c070b3149677b104419ae327a918e4a5fb07afee5e8bbe61fd8dd66962c487. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/PT3KZ2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee33e23ee12a221ed05bda705909feef77ca2acb93ff9ce90c789965fa67db1e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/PTBM11800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ba6efb07ff9e35ee0e4679841a42c725d5eb1522a6b951b542591e2e0b6ed9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/PTBM11700161.