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 0x17fee57d349881229501e5945fcdf6d8c5872ac593f4ab993cad178e00e30e18. 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/f4c16dcc-9e1d-4436-8659-5585e50b1c7a.json and https://artists.proofprofile.net/proofs/artist/f4c16dcc-9e1d-4436-8659-5585e50b1c7a.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 0xd6fb9b53695c74024ead45610a11f14838aef3f9abc763d340fb8defa08b3c46. 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/FRX202044895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891de5475ccb3b4c9650dd00f219438c1f261cb4300cd8f259fb86dd222f04a4. 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/QM6N22115656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b2f752d3e956ee90cf828d348aeb4cd96aeeaa2d22c8621e0d33600cf4f09f. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QMBZ92284902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2b81bed0857471d88c92fbec3c8c772d0a309da57de5b6d4ca63629747b1ce. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/QM4TX2358353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08e842a697b4eece49d6f5083b9e5c0c10eb89ed0e726dcd36119e85a8aecc5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM4TX2389348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558f633cf9e0dfacfd309c8e50e57b9f7d6b4ab7ee1335389b9f854a898adc1a. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DGA052332484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8598096367cca524aca2c2ee5a244c1463a6fd29ec1baae654528dc1fec4594. Chain 2 (Bitcoin): anchored in block 957551 (2026-07-11T10:03:47Z), 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/QMDA72368624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7ecff4fb8809007f0f732d6ad9c94cd47c32b3bf82e0abda51a6e6a91cc4ec. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QM4TW2478972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c620a20c3d9583314bf73a0f7ebe9ea134debfb504e84bfbcd305df4f76b0b8. 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/QM6N22431300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ef81d73950555bac97b27348189cd7bd4b231e3f2db92b99ac820348f7dc4d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM7282433591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb31fe653870c50ca609284684720239a1ceef5747a63d3cc4549a438fb091f3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QMBZ92466036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2b81bed0857471d88c92fbec3c8c772d0a309da57de5b6d4ca63629747b1ce. 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/QM4TX2358353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94640cede1f7b43c6d036ef9bbc38c950f78d8c319c0c6c297030c46031a8eb. 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/QMDA62241627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7415b997c00efe5eab64ec528fbc9219b847ecd34a06b6b19c0db2bc09c7c92. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QMBZ92466039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8598096367cca524aca2c2ee5a244c1463a6fd29ec1baae654528dc1fec4594. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QMDA72368624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50806f7cbd5f9ea56c46864305b420b45345978743410da06a67545f0a07c76. 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/QMBZ92466043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587ee39df873d90c1d167147358165d21ee19dca7974b179b4e7fe8a6bbf8937. 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/QMDA72425055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5771092e101684347adf12609811a358df52d3c089d5537d2fd1f3755344f2b. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QM6MZ2506399.