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 0xc50696a519339baa2928cdeaef19d9256baa8fae0620537f755b69d7b24ee1ac. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/afb15af9-d5c2-4fb9-8941-cd59c263015e.json and https://artists.proofprofile.net/proofs/artist/afb15af9-d5c2-4fb9-8941-cd59c263015e.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 0xb8b3ef75fd42641ff15924078f0c13aebd3fa895286818b42e7ccdcd8ebcf16b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US4XR1340001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f0ae2beb0e3c0ec6160a874d107b0ad3a8cb768eef393673437bc477ecf3af. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US4XR1340002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4943eb6ce79fc9fccc38dbfea5c1bea74873ae911ce088daa5fcee9836e811f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US4XR1340003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e294fc57f90892c2d9ba97528670ba1ade3d342bfdb052584cc50b30809ef6b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US4XR1340004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb5db530b0fed877a5cfd0a85cc08992d06bc790861c8ce38e16ae468d7547e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US4XR1340006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1813caa55f3692d56b5e1973983470511392c09364675ff1d85e769918eb9baf. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US4XR1340007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffef39e66322cb1c29cb406503fb7ef4d1aba4811c6c967ead9af8facd0ec7ba. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US4XR1340008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b74c7c7aac18e0dbc523a27a32a22193776f2be6060d1891dfcd0488c0638bc. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/US4XR0940301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f67f77427a7a1788a571c72b4bda3daf3f0538f60bb74ef22489547767c4b67. 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/US4XR0940302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee4a9b993a48642b874047de658b3b9ce25a42cad8eba8ad272f6dfae628393. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US4XR0940303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567f29031657f34f589e3247bf97b25c961895a41c9780efded2437bd41b11bf. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US4XR0940304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750d1a628069e871a53a9edd594fddcd9834e477a912b6ddc2592f264fcadd33. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US4XR0940305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe848e89b3b98c19924dfe56b3d9c99964add48b8831be2e5e2ac58d1597fb7d2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US4XR0940306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e215b0aff8596d774bd8ae02ca6001b7bbafed02a929b39d6bcf9cbf6b5578. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US4XR0940310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eeff12a5fd60670b3b8014381eeb819480eb7b7b355510ac52f72dc6cad51a8. 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/US4XR0940311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b02f91685d1cecdc373f0c58491ae99fc1b7c61c32f3a3f7da608c2833f225. 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/US9F31200575.