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 0x866fa09253c7255731998a74ea53f1b46914c5318807b056fa12195f6fb6ea54. 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/8c2c3a5a-d690-4294-a53d-a28716257849.json and https://artists.proofprofile.net/proofs/artist/8c2c3a5a-d690-4294-a53d-a28716257849.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 0x0bb56dc4cd0f5928a48595113d967a38152d5d3f8e8384d21e5439543db7b788. 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/HUMAG1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ba7a2db1be24974e9a2f7f8253fb000a95af06e1beb87ec8ffdcabcbfa97b8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUMAG1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0405b916c21f8f6178ed6544420ce2bbf488d4008f6a75a47273c7626cfd281. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/HUMAG1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0c686a7bce51d40d548ee536b82dc4a3537c3e19d2b082c2b340a1b7019495. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUMAG1600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2331a19a10487a6c41bb3aea2431724111de9fac4924296d30208c82ab89574a. 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/HUMAG1600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46966ad28a90756fe51fcfac0469e6771afebab73e22074f2dc88463359c649. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/HUMAG1700260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8405a8df21206b231db198e89e60b1246a00bbe6907844cbf145fc7026813b97. 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/HUMAG1700261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f92ac539799718a0f215842ec7b3ca4839e52e363178c6e16ade00bfb6c951e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUMAG1800229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18701e2845696d0fb0fee222915958e14042f6ac63ad145e6703b82feaeb70e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DGA052312554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dc23e6448f2ec044de2773152cab02a16aad2033a1499ca4b01ae92c7ecac8. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DGA092304198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029fb8173bfa6566fc96aa6b02224dae1a520ff569adad00fad81db43861d360. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/FR2X42448291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e60c1f261ee5d75ae150bca1708c136245ad4a3b34c7790ad827760bddfdbd. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DGA0L2497067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0318c52b470acb5042de45917be8759776288efed0ea97cfa3635587e09fdab. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/FRX452566992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec2eab69db316be931c80d6d4cf05674b88771bf36bef84c0ac366d0a238e9c. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/FRX872593773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05abb0a059543030bedf8085b0035a693ea535b23faa31006f56891143db2139. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR2X42234559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232567c683d012e8139f24c1cc70caffd03bace76539d0459dec9f90bd52a653. 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/DEAR41351709.