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 0xa7e1d543a9e36499002d38a22eb2f84e60570169722124ef417771a4aaa770ad. 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/1418023e-2ce4-4675-8231-2edda34e36de.json and https://artists.proofprofile.net/proofs/artist/1418023e-2ce4-4675-8231-2edda34e36de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tango Nostalgias (Música de Julio Martel)
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 0xd871901bf9121c65509f3cfae4f43bbcabb1a9af204f72e23f2301cfc8f039d6. 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/QMBZ91718995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735383d565fde33c7f3ea7e2f389167d1cf4a0d9245ef715677556e95c9a8708. 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/QMBZ91718998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19c52de4559e1e8e347c9c0965f77f1402886db2eebf1c33352ac88e775d971. 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/QMBZ91719000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb6c17e16f0bb5db96d07abd31f2cc602962dc616a3ed450160a2ef8440eb4d. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QMBZ91719005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018b0a720e1d4886e65bcce5ac1a8e4c9ec7eb85c252687530b9cf8d75728b6a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QMBZ91719008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9271348843aec121885d0aa19ea497addd76bd7b1e388fb90257ffdf39e2d48. 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/QMBZ91719009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7270183fbf18766d72a168379ebcc637b9b6ea25213658af7c0d9af7f3a8252. 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/QMBZ91719709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf837c78841947494fc0cca2b6804c2b6a9019625bece955e072ae5c61e20b203. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QMBZ91719710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1e72ce6b3e672ba0f684f8d9ded9fd7875b5bfdd543d3c96c4a8862758af37. 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/QMBZ91719711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4ca2ee6ce37e3f716c19e078626c320685e86ab2538f2ed989373acd8f16bb. 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/QMBZ91719715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff9c20e18f12c42f9d861ea6e4fde5dc0a58c1afc06cb179cd5c4ea49e1c234. 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/DEKB71689562.
Zorzales de Antaño - Julio Martel con D Angelis, Vol. 2
Soñar y Nada Más - Noche de Boleros y Tangos Con Julio Martel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca042708a24b45114323d68c2b76014dd038d4158c46c192c5735c4261599c1. 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/ART340900195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6738ae1cb790dc28a93a5b9109de7df1e4a4e619f466c3e48167569f8fe3e433. 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/QMBZ91713742.
A Dos Voces - Los Grandes Duetos del Tango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4534bdaa357b09f7b30396d5f95828f74d6430f758967c16cd5c323bfe29081. 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/USA561307765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9882e4f619fdd3226c72dbf1e973f2053d80cf8724451b9d7caed079c85b66f6. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/USA561307768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa218421a91ad5ccc98a34142732844016fda6819fe2b24dec3e6a5605f58331. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USA561307775.
The best of Argentine Tango Vol. 2 / 78 rpm recordings 1927 - 1957
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5e2cc5d50fbbeeb916b9c8efaa78e6c8b09ffb1d07ae78cb61b24437da0eb8. 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/GRHR10638703.
Vintage Argentine Tangos (1928 - 1954), Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839c31a934b1b57563c89fd65c907bd1c823853214465a238e7eac05f4156d85. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CA5KR1575262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb17b7137cea8c01cc7e87a9af55866e4dd342e2a20aa4de326c6ef8bc1c64ca. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QM6P41541321.