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 0xef660c52144b23c8c9fbb051b0df6285284f6b88ded2417e38325224d228f9d5. 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/df0bbfdb-bce2-4b44-94d8-957a6ebc4603.json and https://artists.proofprofile.net/proofs/artist/df0bbfdb-bce2-4b44-94d8-957a6ebc4603.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 0x5de6626cb3ac95928f6911da637cba813db86d48df21f8dbf266f3f5d16d9f42. 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/DEPI82324862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaf8b14874f19ac2306bea0a8778c38a60e18acc0b8b7a2c66d8c5a5dc7199e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CH7812362582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6b5dbf47c9cac721d94aba141a313611f0c8d9fe4c40b48023817a501fc533. 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/DGA072374640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ea224674c05b649947095a8013b7a60e0b50243009940a99c576c2c4499e45. 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/GX8KD2319830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cffeb4b619ce214a1868fab7efadde9cd9d645059edb3615f6ee893100a7691. 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/GX8LE2370745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c83f229a62acf8ce619507978419b413b9efd146511fa86299068008c3f440. 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/GX8LD2346419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dc69684938627b607f60b1c08b7043ac8b610b1cc9f6a3a754708ecb77e48a. 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/GX8KD2384403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa950da740d567b290d8c78d3f5b93106069a535bb3de896011cb64c7351be0c1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX8KD2328241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9ce18a754d9baa1e554b0c1b70e402c7c34ff52c529a8b24987eef6df77f43. 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/GX8KD2395204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35084120ad7c24885147ce740ba1751751892c5e0fef041ccdb008b8da549b4. 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/DEZC62333210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47746f06b7320d7819de42e112db7da9e325394569ccc831f4d41f8f18f8974d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GX8KD2381473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eeb5613c5a2d4db6263bf9e77178dd11e95d8ec5f2491879d5e2e4e0633c88c. 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/GX8KD2333134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bb5a38bba065c264f59df2cd0aa67b130c179868ea19d886571aee15444dde. 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/GX8KD2341635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9cc35bab3a6f9fe8dcb5f1952614ecccdf46670b8aefa045ff3d40dce5c46e. 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/NL2QC2100868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc3d9dff6f665db2f8672f735fd5ccfe97a7a5bfc5ff2e2e5f5818876ada1f5. 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/GX89G2372920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9077acfcfbd286dae5ea8b061b8479f2a9a0a56f90b98837da01047df087092a. 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/QMFME2249099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02419650bfdb47d3c3dd6d3da516a5b522e1b7155a78db9ccf7d05b531983225. 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/QMDA72205691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e8f43a75ea8d80f9ca1e97f7d6e5ca7f708f1bc9b12fdca30dc6d3d60f1e43. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZS662292233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32762e00adf58a5ad2edcc5100cd33f4a717c69568e882f62a98facf4b80feb. 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/QZMHM2269786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1395434e33a44f71e4fd934713fadc687ca18972148581119ed39d8819083a0. 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/QZS662279355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce22e69e9892f848fffe4e0cf3ee456d59c48ae3bc09a9bddf0517270a8e316. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL2QC2100491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcb00c3c283cdf054778325c3136ad0bda32eb4cce5e628c6d8d6f3537a4c3d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZS662223885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76c4b6c7d835d8233c1fcc0fa778f6d4aab68f09acd99ec499a8e921f85c560. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM42K2291357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3504dd514b2c9e634c50bf3575af9da471f305c282311aab167cf5da99de1b82. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZS632174482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09f8908ff0f158038ddde1ec6292dcbb6f9938936adf356e48165c8ede25696. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USLZJ2127924.