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 0x8dbf5883041079de6fdcf72d3d656c0ddbd99bcc16b6a491a752d7e047fc8870. 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/0a52d6c7-a67e-4d07-83a3-523dc8504e43.json and https://artists.proofprofile.net/proofs/artist/0a52d6c7-a67e-4d07-83a3-523dc8504e43.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 0xac705f460908cd724e14fc318ce35c10b2d6c7ed78780754ecdf6fb2376e0522. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/ARZ021102927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfb6b5a0b5f6fd83be6ea8a6b390ea1d8b662e090a2a51f4a0dd9cbe2836266. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/USCGJ1520965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5a757f3c9f4074313f82e68095f05dd072a2924d85a956b91d503f4f35fa6e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USCGJ1520966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8bbdf1081373d01cc4a366b91408185f618c63182644691ddec1c023de6100. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USCGJ1520967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1a9a59bec4f45c8b5c603754055f916cb17984048f91b277d04b0db49239db. 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/USCGJ1520969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15060ebfe9c02842d5b26f66288d0c27cf005dbee3b4180372e200dd74d6852e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGJ1520972.
Uno Resuena - Chancha Via Circuito Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f010900649db073bab97fd081603c8fdb1aa887819ea58daff0859f1bc6d0d. 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/QMBE21802101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc13c4aae5230908cd1bb71254e384f4deed818356134ea8a1bfdf3e99f3313a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMBE21602501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b453a4baa503f739f3487e1d5f4bfe546352f328446c8057e238d7b7e8a814. 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/QZMHL2048327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf93b9b8d5920d38f16dbb469cfdcfa2529c5ee5e228930e62dfa485c556f013. 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/ES71G2407527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea9dd05a1b355d46dbb81e5e9e9a21995c46c144266731d92b560af025312ad. 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/USCGH1689579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a31b7379460bbf52ac9d52baebe89620f363830128d4d2f5c7885b72af5e9ae. 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/NLL8M2002065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a0b25fac15085aaacb6ded6b88390e29ffa5eb5717b589db797737ee765290. 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/GBLV61503494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453f542729ab695d804ad4b6608222e3ac52edf0d8474e598c2fc84e7f59792e. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/AR8TN1600027.
Tributaries: A Remix Album (El Búho Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f1ff3f1a73cde61e03628fb8cf6aa81a548ae0628e6235f89a06fd29a198c0. 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/USCCW1610852.
A Guide to the Birdsong of South America
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c305d110ea343b2408b798c7fc5074e2889ca7b99d6fddc434268be4efe51a. 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/NLF8C1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1249e40c2d4206fa73b8613a172eefc565df7a6aa475ee817eb6aeee8dd2e51f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCACD1536816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1454a3e5439c5e0cf0c871712d5270f075758e0ee0d927b00ad79fa60178d0c. 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/TCACY1762024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312fdbd5db51099254f88d7a59391bfbb8e39341edb3e5ec55f303dfe5042af5. 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/GBGLW1100148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f010900649db073bab97fd081603c8fdb1aa887819ea58daff0859f1bc6d0d. 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/QMBE21802101.