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 0x1e783cb2fb72033f946a157e741a222f418506c6f97a84c29421c372381b41d0. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2dbfe58-94f0-41ab-8598-a23493904796.json and https://artists.proofprofile.net/proofs/artist/f2dbfe58-94f0-41ab-8598-a23493904796.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 0x07fd6d8834d835e67ee1b44f5527ef9e8d17c5d5094aa06e8c6d97cad5857a00. 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/CA5KR1551725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02c837821648549aef77023bbd254f066a889d54898fcd126dae13e07d9cc93. 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/CA5KR1551743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234d8b791c9bf9d6fe646648abb00f1446883fb1d2695ae8283656d26367684e. 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/ARJ821000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7af92cbc88ae6f96ccb679af2b752aafe2d2e96f3f6049d5bc08a3767b93ca. 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/QMDA71552882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9976b66e4cfb60cd9bceb72e4f586ca5921584475214d520c4ce9ed166353b. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QMDA71552883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32beb65c3ee251cca951a2c3faaf0af97919435c26cdad848c358af51f05b0a3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/UKXN22472020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d13a2f036b212637dead38ef8b9323c952af6d7f024ee8df340a9c5dd1a917. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/UKXN22472021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e720ba6b510a7b71d9ab419b6b4e2bf78894a136c33cabdce76bd1db901b5f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QMDA71552888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ee5eca7f22ce596c9a489e736a2190f6ff5420bee84e7097d89f0baaf6e1eb. 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/QMDA71552890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63716f72fdcf1d7769bcc78e922cb4e7d2661440bbf76c78cdfb6ee3ee9661d0. 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/QMDA71552891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053003b2e19c5d9517dd012766f8dad382ea022a7b2f53139c4a9b553520e368. 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/QMDA71552894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19578b4fabff1d1fccab4747d9bd4d282bc2d019ea2dd7bebf228cc9db6f996c. 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/QMDA71552897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4abf3be2463846a4d93e82565821521ea83dfbf18553ebac276ad98b10ffbd6. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QMDA71552898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3962ba0847b91cc564106438e6109c0b25b1c79086b027ba4d4c04161259b15. 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/QMDA71552901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1df606114103253d0f0f769b6335e146099e3e023ba15b5cf9fba0b71419db. 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/QMDA71552903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d772f8ca12e5ed38db4a271680ae3c0bcc9a35b2e1d02a33dfd6a69ae37b8e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBKPL2028362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8db4cb6ac208db2049e22fd99164a6830594def91b806cdc05a1f023a8d04d. 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/GBLFP2234704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d2f2da490e2bad8acc11abfe330517c501722bd69472546bbe2f52273387d1. 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/GBLFP2234709.