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 0xa143d90c6b866171357f4050e4c19e298ee28659c786e00ab046bedbbee4c885. 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/f08e7554-0c12-4fa5-a730-d1a6fc93ff86.json and https://artists.proofprofile.net/proofs/artist/f08e7554-0c12-4fa5-a730-d1a6fc93ff86.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 0x7c48092c3c3de910d8275970b8a70b92c577b55bb0f9ee4f61273a00ce6c03db. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USDY42354268.
Matteo Carcassi: 25 Melodic & Progressive Studies, Op. 60
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f62e89d5a07040e18fa11be60afd06dfca1615bfd635dc1ccf12f6f1f1c59c0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZK6M2294584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588e0cd5c7b08b5aa8bbed622c18af96f5615d105941af3e30dfe9cdf259c03e. 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/QZK6M2294585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199d616946752b4eeda40984bed8d0cde5a3575be46c21816584f03c3bd43b5d. 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/QZK6M2256085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250e17e30b2e5048e6263f6b4ef085813c16bf71f46a1da0fe0a366e646b8108. 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/QZK6M2294586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3381a1f9f8cd9331af55b7023ffc0fd28703dfccdd703338acad19563fddb3e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6M2294587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b03699b4f7cc3b484c6b557fc80f3b6ca8f3a42f04817e02dda7a9c7a0bf0e. 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/QZK6M2294588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7712201b60bb9c7905c54b21efaabcb664c05447e22fc0dcf044bef3fb50027b. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZK6M2294589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d61221eb4634fc38e73114ef35df0b03920c486ef1f23c4d9b346994ad9528. 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/QZMEN2277192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b790e7c740c5a229409d122361e9ffc1a587a5876a5f568bb9ec40c188b7c8. 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/QZMEN2277193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2284772781c8881051e8b24c778ce26f2963958c27ece71e8400a5c8a4f4fa3d. 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/QZMEM2270660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9853f6545dcc5699e258d8820a8b2f5742c9225c387e89c573cc42d830081571. 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/QZMEN2277194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07292ed2a875fd5ed3b0eedc29a5875b6b44cb25ab5ddb931fed7fb1278fce3. 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/QZMEN2277195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151eb5fe9f1a158959e65e7d7ee186f07ae445ea8d2e9e00284158622146d668. 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/QZMEN2277196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691faaca408094c626bb9ae170242c26a7eff215ef63bbc8ad2a5bf9a17681a6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMEN2277197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b7410df6376fd0fc59cdbbb560cf44dbaad5f0a8e5376ceeb9107d481cf055. 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/QZMEN2277198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34a315d210346e8166b046995c926f75099fd1080f072b61b82dfdac764f606. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEYX82141893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391e40347eda6e7067fdecdc3b90e294638524b13a8c7fdc1af8846f6d0ae978. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEYX82141892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0942eca326412c26bb0691728cc290dfb58bd76eb479d2f0f1b35bd893817b. 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/DEYX82141891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7ea5a01067011130b1e82a9fbb2acd2e8a05c05c61bdb0a420318e6f1c1461. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEYX82141897.