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 0x849debc5175c40c0340eb5f005c9d582a5ba38c85e03f79881cc8cb815c8c5a0. 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/835429a8-684b-430d-853c-1acbd5543ba8.json and https://artists.proofprofile.net/proofs/artist/835429a8-684b-430d-853c-1acbd5543ba8.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 0x2457d18f9208e8f7bc5daab3d859b0b273c76dc46d4ad2d932b5b3d9b8f8a110. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USX9P0954851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bc9937368e906f840d3a08ee3b519af7812f224e6f67cadb476a7f929c3955. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USX9P0954852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1f6c089b8766d834405250e6496e96f78813d3605e2b80ee6e6a10564aba89. 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/USX9P0954853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f486473991e5c30824fd82ab008990eb3c2613f146562c610c6965dce26fcc4. 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/USX9P0954855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86d5adda9ac8ab39b6eae79798959b182bfde8e3550bb5af871c59e1f5bfe20. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USX9P0954858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc685e808e54635524b612d479d2d58c6390d5356c67119687a2583539cdd3f9. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USX9P0954859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f73630f4d8888d849fd189bdc2c15d174d0e3d5d0c94d3ac78e0c1ae11d2280. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USX9P0954861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da758c871bb9172a99f11e508509394fb10c070cac658fdb17ae2ab3bdbf3dd. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USX9P0954862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d7513ddd06169fc3dd3bee27c1d61d3deec398d8b0cc725b7e0f7ee6d9a96c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USX9P0954863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c270ec76073c8a7ea19893b46ecc5c8aa8d02cc15d941391ef68e8dc7f214d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USX9P0954866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905b514037a6b5e235e5dd8777a96b2dc677a32cbbf03e68ec0429aa07a8e09a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USX9P0954868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032d827d5606ecc6b9de2acd93d1c2b9661d334782ef7903ecc8893ff3cba7c1. 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/QZES82412113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5370a25de44d8535458e2efc733f3331d5ec451afea8044843a2e13a9a190f7c. 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/QZES82412117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e48dbd3e61b7058fdeb56f3fc8125554f41cd40fdd016eb591ecb5389a1019. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZES82412119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355ada346118a2b8898af6a7ca9e7dcbd92815e29d5ac454ada6c46f7a8685f5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZES82412121.