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 0x3908ce007901b7ddbf69392d0f885f7339195d8fa1dfcd62744f2f71805a6404. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93f93106-3a2f-4af7-88e2-c34c15587a8f.json and https://artists.proofprofile.net/proofs/artist/93f93106-3a2f-4af7-88e2-c34c15587a8f.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 0x4c71cb1bf55c9d6831be0f2a1bf88ecbdd20ea9162114fce96e6a9247b6dd251. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZZ782594279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ddb466dce9c7fbd233c9c9dfce0904503a19f461fb927aca4cdff25697b192. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZZ782594282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5155f7a32893ceb2bea0c4174f82dae7d3974088ad400f71dec41ab281ed9e48. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZZ782594283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d2422163263dc1a4598b1f6d6001e0b7bbe8f76188ecd9ebef3d35b82b4cc3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782594297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471bd6a94d725a7acd1bbfa11d6884cf2b8af573ae5650d738b3903bd0cccb4a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ782594289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b035c29c676a7c0f90cff5efc3c8f0077f8bad4eb88b8698dcf07f2e42ae68. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782594285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26e41cd6aa15271f2bf44a9c7667e4882db0175fa586fd62ef0ecc9fe43620b. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZZ7K2500373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81a457db45123e626918ebf0f12fa4f7623f33dec9c7e4c1d6183a530732a5e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ792598512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6ae9418a1d70dce50848bd0a0724be28915eab5f968542f4b93b1580e2c9ef. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7K2500379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95188aafa4eee1fb371e82b669fc91a7de971839b8fea8da0f9d0182d52f2091. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ7M2505184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09b4bda7959d3bc457da82b85c0c44eaf5275c3fed5b021c679ecc59cb8c4be. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/QZZ7N2508155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9575b25e173dee1e535b93a2bf51c887c92dba58fbcf4350ebfac0647209f46. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7K2500385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24620b40516d49b7124bb3cf2afd8b53e28a5bab7d7475dc96c8330fa0180c69. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZZ7N2511058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5bfbb793da5ff5519d8cdcb01a8f32d07729265bb87911727436e643f32d98. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZZ7P2515056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e595c5d5fba648ad530157c5a0d6a969b0ecf9fcb78c5fc3a9d39dcddf835f8. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZZ7P2515075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c16934b729e13b77b7037405c2a61325fc75251fbab7fbd9ca363a2a785d73. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZZ7M2533857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc115878df31925e67267dac083dcc894f81ae85718e485436948d2e76fa18ad6. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ7P2513091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44b23dc5a4d650cadf601da5755831ce6cae39e4dfb52a5159fae79d3543580. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZZ7P2515062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8935ea10d4c959c96954bf82e24897b0e944899c6b3990fe2b8a314d0c16ff4. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZZ7M2539012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b326fb61397e4516ee6d367a7508ae9e8a58da746c03cc407153b944b63a9c2. 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/QT3F52593609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d260042ddd5ac610f3e25179e00f0eaf3e2bbb3103be6a2941f8deba80c27e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QT3F52595542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dbbf1065e067a4a784f75722347a73eb1b870ea5f6ef76f1642b550c2a86ce. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3F52593622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5352e294e5e9698f0fecb66fd1fba7d9eac5f1146a2263fd20958fd9ba48668e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F52595547.