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 0x3f75bd666fec863f53c62a437249a433a3798500bbab92f55dff30344791bbb5. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8ec475f-3ecd-44b2-8440-43323435ee44.json and https://artists.proofprofile.net/proofs/artist/e8ec475f-3ecd-44b2-8440-43323435ee44.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 0xb113dcac19ae3e34063edc8810f847274da7cd0c8af8bf7ca85cc6afecd267ef. 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/QZK6H2560310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409ff64a886f927ff2b1e2b6271dbc0211f838b3150d311aa84c2d0d9673510e. 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/QZNWT2520833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058ea89b302b6eeeea8109fd8226a0324500846c8688ecaeaf4159b1cdf5d30e. 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/QZNWT2520834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c1c5152d0981485d6c3af3092c5ab8d7a791e2bf3d0357de6280e2561ced16. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZK6G2521946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5d1195d86a34e338aa708d20d0c8e74bbc9284a2cad018c8d6affcb1ec9c5a. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZNWT2520835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749329d9788eb66ae8a795fa83e12b5bcf8c0fcd22f84219de2fc625922f3bbd. 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/QZNWT2520836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b79596d57117365254a73213156ddb8f8fc3bd8655520528dd8e715fc3702d5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZNWT2520838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b08bc8097322374b63a5fe757522d7e3dcb403316e81d7a20dcae9a6c5937f7. 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/QZNWT2520839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb113dcac19ae3e34063edc8810f847274da7cd0c8af8bf7ca85cc6afecd267ef. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZK6H2560310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f77fd706b6bf1a4427de835d9b5b5ee02899dae3f1bb7bfc11c81fc7254801a. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZNWT2520840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b141f927803f963b931e0d24d8cd663cac0a283172e28fc706ceb9ca8b08e03. 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/QZNWT2520841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0017c698905d4822ce176175daf746b94f3018dbc2079cecf4d3c12375b92b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMEN2564168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea5155bafd51168d8ee8fd99b492c6af658eb6eb9b6cad5d78d8a8e5508c1da. 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/QZNWT2520842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267df9bd9c6cad46359346b72c576f4ca5be611170289ea91ed0e98a2049251d. 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/QZNWT2520843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc632baa4e00e5ab20660c89553f7f3a084cd687bb7650c118889bd3a34b9ac. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ7K2599421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bb04ad1d164a662375bb740031780218bff2cae8a58a59444a946769fb2049. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZZ7K2599422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ce1934ee7d210db33e8ce1bc939540b4f93bd3947b5ae572aa4f59310186f4. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZZ7K2599423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a099645d4cd445c57e0c09473dcc6388bef0fbafcb601afb8fe4aa1434d24c. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZZ7K2599424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddacb419ec90dc97ef069e8bd0d0baa6727d451851c3e371a11dceab8e994e2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZZ7K2599425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22adec5b18f6cb07397bd5ecfb5c237c8929d9bcbd2c00f1a0104a119e8adb68. 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/QZZ7K2599426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe891b4bed7bbc91b5b3a27fa6c6a418e6c526947abdfde1cb39763d8e20f3d. 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/QZZ7K2599427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf02360cf0e5d73673c4ce8d1789c14f91f154198ba48ae0d3545e0bcfa145a. 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/QZZ7K2599428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da38bf5aed942900756cc14ba0a89aff52e12371863553154bb49acfa1baa13. 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/QZZ7K2599429.