Nelson Antônio da Silva (October 29, 1911 – February 18, 1986), better known by the stage name Nelson Cavaquinho, was one of the most important singers/composers of samba. He is usually seen as a repr
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 0x73c57632b3c8aff343a8bb1a6d29310577d9972c0f84eca15fcea2ade7a93745. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6df53aa2-3980-4de1-bc13-04c825f422bc.json and https://artists.proofprofile.net/proofs/artist/6df53aa2-3980-4de1-bc13-04c825f422bc.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 0x13e1ca183e9945f83ecee8d6ad783a24e1813643268ebffd746c1d5517799ae2. 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/TCAFB2035519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9021bb55106c8962a3dd8a30315129dca931cbe568de665deaab24a8226c16. 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/TCAFB2035529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8356d9d12fea0f068117bbe3a34ea86818298b2be0ae7c170f42113977e066. 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/TCAFB2035539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8f3c40aa4dc35233fa134da5212d9f9815e7c2c450c188b9ed2e349f532c69. 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/TCAFB2035542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb0f5741276768fa95d26cb369db88941932fe6c47adf0af604dc395ae33b28. 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/TCAFB2035547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c16c6e7eff27a25bb81454da1f6dd439643682e0ccc64be551495831d2ec9d. 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/TCAFB2035552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0f4c7984d50cc24af1b292d8215a7e94032680f98bfbed459a1ed4e183879b. 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/TCAFB2035559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69623bdae06c03c39487ef8f99168b8a08d2678f4a65d890c066c2277b461d72. 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/TCAFB2035561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec754fc6ef54438cba8ccdd26e1262388ad1792164c762dc4eabc562cbf5b82f. 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/TCAFB2035569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd7df9208939686868aa9d0fae6ae1611c55eb3dcb9a4f419d801c170a2f6c5. 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/TCAFB2035574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9268df0663a9bbef81eb8ebdf91818980ed2e9d7ee9754dd93acbdf97f3b15. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCAFB2035526.
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 0xa208ec9aba3fae6b03e059b5a90c4802055727220c3a1549a94a3fe0c04de2e5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAFB2035536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c7a676305978dd3005d0f454b4be15c683d5028e5ed13d5f7898e6618a1c4d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCAFB2035556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eac038b9f622672b0b89ab4a05d47a57f835b675de25f96165a39a134c30ff1. 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/TCAFB2035566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0f759d4afbf52a344c821a0a41a7538ef365859b5cab1e5281aa0a1ed99068. 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/QM4TW1537770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bb6ae88b643e73f2fe538035640afc7e96a14123788014b2e86ced1f0b6bd8. 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/QM4TW1537771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1277ac385280af4d252a9c8b9571f9afb810d2f2c01a3206ec326c394f9b43b0. 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/QM4TW1537774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f1311c57b2c2e75b2715147cafcd4d1137c7d37f01fc6b27fe5db0bc91bbd3. 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/QM4TW1537776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbee62ff21f82a10d7ab813a4d891d2f130d6015a551bfdbf940aac2ea59a719. 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/QM4TW1537777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cff52167aab16893ae5e3f586b889c1631262873b3e11e7308fb745559276bd. 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/QM4TW1537767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fe725b758dd2b2ecb4b650c30aca51202dd0eb08f1edc6be3360b7831141de. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QM4TW1537768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df25cceb0fb33991cf4784f48fdf2f42fcf5ef420a3dbf0260d5f27a4f6a6b2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM4TW1537769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e749a244a9bdef66e3af2f340e1c8fcd919374eeab023024a4f9f5057e1d3b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QM4TW1537772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3b7135f994f384bb4b58ecd64ebe51913a69b16db46d426adfaf54ced8a7a1. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QM4TW1537773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5310cb25c62d548980d8f50a765a3701dc8daa22f5022ecab21983806a3c1014. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM4TW1537775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e9314a6a1e5c9b7573e5d2a1e02b829f253fb6c3c44eddd6ca2f4d39dfc67c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM4TW1537778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0181896141fa9b9b3822d7899da87da96cc559ef082863a43ace46a67631b6. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QM4TW1537779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526dfd5845337a6a3d65bbb4d570e490259c8b4662527ae5448a68ebd7f15d23. 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/NLGZ20110062.