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 0xa0a776dcef7c4e8fc85666cbbc75350fe675fdbd2bf06319603403f27516e6c4. 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/b2f2c0df-a78e-4f15-86b3-d50e800b64ef.json and https://artists.proofprofile.net/proofs/artist/b2f2c0df-a78e-4f15-86b3-d50e800b64ef.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 0xd553c5a08f0fc30eaba1a0b9d0298abdb7ebd54c9f55958b41b4f688dcf2e71e. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/CAHQJ2107431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28887b43a6463a96d32a8a59454026bcb93a0daae4c801a5b93e0b48872389b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CAENV2119873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafca7c13d6c1da4d0c7a88240318966edc7fea0f412f72b5519fe009c886cfe0. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/NLRD51632817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f633c9789bef4ebdd9466e165d2b0fd943fc77afb250a0f0244900683d42f6. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLRD51632869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c56f384e4ec3e3953189d454137ce14b36ec8454c507c45a31ff709e12b2a5f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/NLRD52119868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1fbac5fa4ae8913945dfa6e09c6d645f70d1474ad10712ada08eda19ffb974. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/NLRD52119873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a4ed72ca657776e1a9150bc546fd184288d6473188986208fd5c58d6df351a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEWO71700507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0924a4eb088daef451c4025a4ab43a09392b1f46b73b02f3c9e43d4b51e3dad. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEWO71700550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ad3951fad2a794056e185036937409d762ef13582df3f4a88578e81ed89dbe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEWO71700574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31369e69e13b8e3c0b3af327d5a6129313d0243bd8164be34bf46956ae39405e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEWO71700597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04eb1e70ff0ccf873dbd3ae06fe44de6a6f76e736c9487c5bdaf8edea4a41ded. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEWO71700618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95455ed461b58c1bb1f860b3c0a5a13e8ee5165ed8a47d5dce0ac3eaac6967a. 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/UKZGC2402217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9a861b599bcc5abd38bb9f138e657ce7ef649f6210de16f0d494cf533043fe. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/UKZGC2402218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7f057ea49f5b81244419b49fe00ff1db718eb3161e3acb3e7a166adc054ff5. 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/UKZGC2409778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0d53b17dd442d47e24ef2d5304c953a355b583d5afa3c4b75810c33e149656. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZDA42361789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1e163d7baf5f54017ceb198a77725ac83f8840e04e0d7d466a0bdecf269a3a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM24S2102604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0c1c41c3c5aefce916390714c3bee0d38c83e9b44a953f3fa6d5f912fcb577. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DEZC62290711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a09f80104f19666c9360d71d8293dbc0f8b3b1c5d580e45190b3b2672abd93. 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/DEZC62279449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22936b167152d1f6b42eac41ea80239b4f0a62540419418ac57c9994da6df100. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/US3DF2252364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2147479bdc54d518d7665c8b8cb9f62a2fce142773ae30c193c84b41577abe. 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/GBKQU2530565.