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 0xdbf5f04e28c8381dc43154249674b6e33103f5322486c6d93e7ce82d32f6b8f0. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/057034df-866e-4751-abe4-7faff7eadfd4.json and https://artists.proofprofile.net/proofs/artist/057034df-866e-4751-abe4-7faff7eadfd4.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 0xad81d4ae471a140085183dc3075184fbe3d565d34e8868f667fffcdff7756f68. 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/TCAEO1900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9687b40733df8c9fbe589d0fea3fb48fd3f13932387d37f41c92f52872d665. 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/TCAEN1999324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ca34de3f1bf382b53f3eb3f5adcb15709e0d9b1e3a9bb76dcbfe6365fa2b6d. 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/TCAEN1998824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52b4a65beb3875f9faeb25dec1a99516e04ed340cc37b8bab076dd9b72f7a9c. 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/TCAEN1999251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b46db84955eee89c9c2358a54d7fef1f0efa6029577e1a5d4a9231f5d92164. 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/TCAEN1999244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754789bd4555d38a3b5dccd700d4e962fb5a6a608299d183166957dcf128b111. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCAEN1999235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f79e753ffa9b31b0aa94d0c05ee1ea9cb6b23d463bb102ed003b90b8ceb84d. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TCAEN1999213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada0f1374c4b61369cc8d9c3b942f43f8d78865c97c9c60551894d37e60337c6. 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/TCAEN1999239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7563352afc37fd8eb28d804383d57ee05d89ebe7ee51f95be430fa46be01a83a. 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/TCAEN1999325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc976d79a873ff3fa8088fc0293d4f654c6416779291523dd6e4835d97b3ad947. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAEN1999253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b4111a024f115b75844d29ba33fa31c97b8793a5acf239b7d90e4162532386. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAET2075089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7545e42c52fee661d0a6626336e3c3f64c102376f84f768969b537c6317110e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAEX2011816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad59465529b89bbae37059a6e1918c41a40dc1e01572489f873180dbb2409bf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USCGJ2214130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59e5488d7c29f51dbdcfa89d23799e311c8c34eddbe2fe2d2ca62b729c3b3ee. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USCGJ2214131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e17e2350a1fde91066dcbb2662c6b1896e7be30b5c7463a27837916dfc0266a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USCGJ2214137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611217d65ca9a56a130066bd118187afd035c3ed2a4a8ce0f96dffce35e9a165. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USCGJ2214139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39728488827ba0cd5b480b47189d575fd6790e1a0c8799e86624acfb36fde1df. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAJO2579400.