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 0x00b59d534b2b2cf7fce05fa0c9b77391221a719512dbe2569efa9d9b83a033e3. 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/66088050-ce51-4841-842f-72938bb5c25d.json and https://artists.proofprofile.net/proofs/artist/66088050-ce51-4841-842f-72938bb5c25d.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 0x7561d31862e81b51c40c85781b0636d0fb6e0204b4c016eee428786cc83b96d4. 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/DEPI82412063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde73c5008cdf437498a787543da3bf5c944c64d2b530121459d5ffc0c2d0199. 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/NLRD52340559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ec4606790f76ad8a58aeece05c0bb9399a37c3aaeee5dc49abe278fa758c2a. 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/DEPI82212890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d24dcafb0b6402682ac8ed482afa249ed74bfbe8740386f49568ab3db9ede2. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZHNA2437152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633dbb5d9892487b73bfb54e2e18c3ff5641d08ef88cf4357923bbeaf24b4f80. 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/GX89G2499579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad1473903090585623c48f68f010d06df0d48e0b3e9bc48a6fbbea8a528f3c5. 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/NLRD52340493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd28af1f4922eb3a987e14a1ee58cf7ae8d16f21060a4ca3a2dae6dd2906656. 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/NLRD52340492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753bca14f69a6e831e102dd188c287440594ff823b76ce8fc4014f3ce417dd50. 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/DEVU52388002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12688409fe2d770671643ad584f8ee5e5812fa56cf14c487f1a4de68c4805298. 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/QZMHN2398893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8bea4d67fb6eb09c00836c513783135ed8494def2f146cc99c7d4549a55cbf. 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/GX8LD2249930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6077197ba97dcb55f9b6e82286c49d0285e41b71db48e4d17b4d62803f4203de. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/CH7812228417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a0bdf695bf486cb7d27b4eac853e23021574b283f0410ae89eea8b72af1b8d. 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/BE8LH2200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c5e574d1873ef2228f592887b2be90b24ad794ca6590c5debd40b177d0aa5f. 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/GBKQU2243333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa988c9e48d6d27af55efa9593a334fc7eb071206885375db98b07feb4b2b44. 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/QZS672228866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb081b331390e70ec038a9087ee1e75abf696aa7cc59a70baba99dfb12713a2. 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/QZS642258337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59caeb76e1b10e810f7101956298041a19204c9d2faa74649d14aca89985e495. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QM42K2270651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6739a0e5035069f88fdb788339e55038b5b663f52813c7957a4ae172e3c24604. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CH7812108645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb38e73fc23ba4b5ef7f6da529a51540d1b950f98b09074629c67156323d294. 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/NL2QC2100147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9691cb44ed5c1476fa0487c4271642fc1931972085fa2bb9ca0932a8f31007. 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/QZMHP2042337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842dea3641eb48c5ece9e77ccc667e7281f2c115312a9226ed3f4951a3831e84. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBSMU8867044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae43cf81927138e769e64c1f2d0acd2f4173f8ddc481392ed9d1bf30d7629da5. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM7282057976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfc668c99d134d2b18bdf9136514f4e1c4d47e8ec7374fcbd769b59b4ef1362. 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/ATEK02009081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ed09479ae0b4bf9eb6238669f1186412af13b0111fb0898a3d0a3f7e91dff4. 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/CA5KR2057619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa684ca829ca4fc414faa266fea5ad413f52b6576b804779944e6383386c1331f. 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/TCADY1811742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6301cc37352bf27f15a394719e0e86e52b7ef232ed5bb558d8f883cb4c0ef0e4. 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/QM4TW1789578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f533a4a15db51692a46cbec2107bcde7ea9abd6b8c656d9bbda202f297a98e. 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/USHM91665121.