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 0x1c7f89309c160f61702c93705c87265c7916c24ba3fed73bd0ce0154bc4e7645. 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/e1fe63db-3373-4822-8ac8-d9343830f035.json and https://artists.proofprofile.net/proofs/artist/e1fe63db-3373-4822-8ac8-d9343830f035.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 0xe114e2b40296db1a9271a7afd59a6339b1024be745790d0b4fb5975fd8a61a47. 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/QZK6Q2360788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca286fd0d6dfc52fc0e0def719a643092cc19ae80ff88ab28ee20340c5b83dd. 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/QZK6L2305400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51e4e8f13caf95a7b3bd4c1f8c4233b24342c2d13b54009204abcae70ce6190. 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/QZK6L2305404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917a00e7b8196eed6417671d1dcd5bb9357cf11d1943560fc6fc2fb9ada2da04. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:05:36Z), 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/QZK6L2306533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235f26d990b5f9e029e8895213f96b353d95670c5749d372abf01a8fd12c30f5. 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/QZMER2388911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414c6e804af5e8d3ef9f5c908e6cd0ae2a653fd4d5559ac1589b80215e8d278b. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMER2389905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0357efe8f660c08cca17113c02c27045fac5f9c7e3e459bfb3d1c3193cbbe4ee. 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/QZMER2389906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a3b6bdd99fd9511ee840448dede441c6b3fbfb6bb9493d6ee0353f10194cd9. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T22:58:21Z), 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/QZNWX2395160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2917aab410f9f841cc5b03dc6809dd60e129dab419111734889bb3230f3c613d. 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/QZTAY2396969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bcaff0c04521091dad1fc2d1208513132516cbc97a821a56662c8f22983743. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZTB82398656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282400597ffb426cf09939908d59de1f2963c9f32f37faa98c7ef0e258a5e989. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZWFK2362566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bae9b836821742e06f94cd1f3a2230110de377b2dad408ac71132deac9683b4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWY2403273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadbd6de99a4d6de02c7118b5b2622a84460078d928c5e3b73961ddfd7c1cb1d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWR2445328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb1b3f8d4d105d82d390ec2b97bae77dc7fba6f12f15fbff2d70165b148c3c1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFW2591704.