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 0x754d3f12dfba6acf6b53d2474a81b1424470fce891bbd068f7154edc4282d1eb. 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/8019af66-0076-4d0f-8215-9c3cba549404.json and https://artists.proofprofile.net/proofs/artist/8019af66-0076-4d0f-8215-9c3cba549404.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 0x144900afdcecf4fbcd7b8ee3c14b9c6f325866fcdf97159cb5a750ac31426c34. 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/CAV4J1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e37e8309061829ce5eb82d37060a266712a6e51ab93aefeda146bcbeb9480c. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CAV4J1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fd21dab4e0b2bca2b3ac95af0fdd70083b4c730811d7f068a2976a83e9cb89. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CAV4J1500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29618f51db69e87caf53fc1bbec2619d16c7fc8988a3fa9741aeccfc55e5061. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/CAV4J1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b157c7267be00ffce3392883b04a2eb524c4d77cf2a107508c1847d5675afa. 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/CAV4J1500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2ec9d37ca6705c5866ded978aa67f97fefaa8e4c990a175775fc777fb48e85. 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/TCAJF2564910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78ff42229091f2db9796791b4ab9a3569e3d14c222723c877d8655928e9dfa1. 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/TCAJF2564925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03468b26d8c3a57ca6267bfd58e92c19b64b94e6262e40a4d0e32d15de8e8f98. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/TCAJF2564936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefba7cbeeaa6b66247b3782cac8631bc63cec432fde6631f6d03cc0cc6686ca0. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCAJF2564946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697da5005353b5f009ca11c93cde4fb3eb818a387a40f267367bc6598bf3b352. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAJF2564959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595e9c401408bf9a8def2750b09f6983c8b3247cdc606ed1c2920da44678c473. 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/TCAJF2564991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c258ff542801524d0f2bd818843a4828c5f6778dfb831cce2401673d3dd79fb. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/TCAJF2564995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd06f5219e3ac3d04e01bbe756e7fbf860c7d37de7482bcdfb19b5bb5ec9168. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAJF2565020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1a9f079011c9c81c68b919fb9a0550d3ed5119905eafe1067ea0de3e7403b4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJF2565028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7afa0a01663a55c111ae9edbd4f6e515c7e04ebd83a96cb2bbe573491169713. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJF2565035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4596f50051c428c3cde726d69151ce6570854f83a5f7fa0002f4cc8d3c0e988a. 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/TCAJF2565046.