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 0x2168a55a2925dc7e4192b80a956fc09ba0ba8f058a044a93fc496936439bccaf. 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/b6b8cbba-24a5-4e99-9151-b6ce0d1b0e65.json and https://artists.proofprofile.net/proofs/artist/b6b8cbba-24a5-4e99-9151-b6ce0d1b0e65.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 0x8ee6b00163752439813db2d0e8325424a98a39a66151ba8f476bb1eddece643e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ZA5I51600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aaad5438ac95662f2645f94af27806179cc3c5104acd12ab90c299b8a0c5b8. 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/ZA5I51600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6131a0737bd2aa2f2ae2ea51e95c83c4df4c71e3689bf93b4ef3fdc7bd5e4489. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ZA5I51600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165fe645f9626b966573bd36fed348040bb058a7e74c33b5c2182f5dfee6e306. 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/ZA5I51600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870cd450aa085ea1e77cba800d831e9076f5d548a8aef603dc6e533d39051ff0. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/ZA5I51600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7fcfa6c56a344ce72129d4324736c4688175c40f5d5ac9e17c094ae2c563ab. 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/ZA5I51600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6073dd3fe0150ca4bf9ca986c501116ec43a8d8968146b6480a79bd06c6228e. 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/ZA5I51600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58ba103ea83c19e1f5d009caa560c2a9a8441fe11ce5b32ce87335866f84c97. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZA5I51600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344950c4081c2b10c24c5206ad8a10b9c1457e11d4d43f7767e37072cafb5d06. 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/ZA5I51600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa1905a016efcda481b5f7e347056557a64e1a030f99fecf59887d8ab35a747. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/ZA5I51600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1402a9be992aaa34dfc61019c8b1dfb9b991bfa091d59a71cafa5ee533e4c3ee. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ZA5I51600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd518c2052082a56d24eecfe5e0348e0cc2418da215bd44f82864b4c5a0c1bf04. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ZA5I51600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0ffdb2b44473b19cfcb1b01daf6f864028a09e08b8e0dc016dbf4190bc3acb. 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/ZAC012400506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1149f55c9f863c28918ad204d5ece08839441202a58b2f5049990eeeb5093fb. 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/ZAC012400397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374f7f6efea3213bbb002a4b44fde3e2000b365c107d4c58687ef779ad2b7f4d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ZAC012300879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424280a5ad7f1356e4bd1fdaee88086fc84188f3b33205ff6811e615c978d565. 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/ZAC012300881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78fe47e18ea2b852f72fc411f80373cd254e2ed18319b9d7a259f69cd9597c1. 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/ZAC012300880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc67c3c4bafff5f55121761db72ad4c8cd48f2f169a14ac8e01d9007b3be486. 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/ZAC012300473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ee8c9bc2d8ef6f4b79ffa6131a5c882ea77e09dc029ecab8f5527e92b7be22. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/ZA2619000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0266d4df2b63b1631846dbb55633336f7c9a4e07c9ebfc6c2972fb8ae37f7287. 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/ZA2619000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5b63bdb6cb02f1b241212ed7d4edebe338ff4d3e5347b556434ef010685b67. 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/ZA5I51600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5650c26b3b1612ebc85a5c2f9fdc5cff67e87603cc574f8f8d59768ca1775a. 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/ZA5151600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f7641df292f419da74431825c14e0b790dd3baf17d54841b6d5cea41c4c4c2. 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/ZAL071400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec79a062f733b8c662d83e22851a87935a19a9dcd3fdddab95b9d8e01ec6be01. 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/ZAL071400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7ac0791aa579a0aee220a968859aff609d0b6c68090d94ebb96fc1a777816f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ZAL071400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e27ee496fb09f173879e07ac6803c7a4fb740c7c57bef92dbe4eb4431b2a960. 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/ZAL071300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05df4a16f120c9b68730ac82837b0cb34512ce4e7a704b3e663425d5f915ab3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ZA4LI2100010.