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 0x7d90e431b861a381fc6c0ef88d06a833a71894f20bbf76549ba9a98c6c5e0983. 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/cf210420-4028-443a-8b07-1dba2afb0ae3.json and https://artists.proofprofile.net/proofs/artist/cf210420-4028-443a-8b07-1dba2afb0ae3.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 0x6e42acd0a363f42a82071eac2a30ec9b89890a8790fb0fdc14e976e9b8b481d3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFP2322451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9bf7c0fcc018e9b61e1dd0f95d1983dc60d9df216ac47510b14fe2f915dc29. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZFZ22454905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6f20b1bdf4a6c5641c93a63981161cc85f0d7185449fb8afd25d6c8cb027cf. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWFV2481416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595d08498c25a12aa1a9fa418a6038c6d974add9d5e1e94ba73030b3d7649124. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3F32446222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4277bdc6ff023a6198ed3b60cfd25db1af89296ff613bf259c3cc01257c0703. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QT3F32446223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14585277595320d0e5e35924770980869667d87f0e06c9a88d6699b02157f45. 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/QT3F32446225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552222375c5c6861dfea4400bb06722531b5cfebf10fff8370172a0826f31f81. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QT3F32446226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfed6ed7120f94b599d05534d6ac7e6af1dd68a8dabb4320176d37178c51851. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QT3F32446228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9b2a3e8f0137da40fe8abc4c43066dad15b3c7ff785cf56083e927ebb48032. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QT3F32446229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0437956cf7232b7578d67d737ecc0859a2570ffcb7fd49191120b02f43ba49ef. 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/QT3F32446230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6661b86515f9041e1c32c95c227ee0ef3a85a89c93f82def85448e24f69f2567. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT3F32446231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58769321fe88a995c32e81af262217f83b4cd181fac9be8bdd67290db21008ce. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QT3F32446232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0666927f72bf5fd1ec984d7e9b346e7fc776278c7ac01ab1eeee5001c23046. 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/QT3F32446233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0812329b431d99443a1e0b47de883a1f719086bb348590202bac8ab2a6ad9603. 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/QT3F32446234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842f36bebc761f3dc30ddd5522cf0ebb65cc3599a689c1fbc7964413619e8c4b. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QZZ7T2592348.