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 0x52eba3a934479bcf6b38ca0248f2f4022288ab59dab73583438284b437a97e3c. 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/d8ae28d3-bf1a-4707-9af0-7ae2de9f794e.json and https://artists.proofprofile.net/proofs/artist/d8ae28d3-bf1a-4707-9af0-7ae2de9f794e.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 0x6273e1620e07aef7b73a8e52afdb760d7bb72ede4f399a838c4c0d3e085219c3. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/DEPI82448389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1051494d993eaf30b7f262288a4a29ccc5c77e51b0cf83d1e48fb12e05a9ed1. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEPI82448388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e07da6fa0821d8184179313c67827305ccfaed816fc6df52d054682bb5f21ac. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEPI82448758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16f28a5819c8a8b9b8002ed86f470851a5e7837ed5939be1b68fe0e4c1b5d3c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEPI82448766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7452bb126643cf8ef4d74d30284259cdefbb46da9f3dea01962d2dbf2d4800da. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEPI82448765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793d4c03738425fee489291c38b02d600141bc211a8eb793fb3596693b130a7a. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/DEPI82448768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5049e4f36164ece19479236f29b841ca91deaedf5828cac07dd1b24a0e989e. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEPI82448985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da2df2a47118971f9305907d355f011ff63117aec6675fcb68e1d0d6f5780c7. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEPI82448986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547d8ca375d6deea5b3c2649151eddce613bf030174512fc199ef6a3409dfe31. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEPI82448989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46eb19c685c7e6bbebc13db0a2c91fec61a75407b7e6601197c01eb4c8a8f874. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/DEPI82448988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c364e9e139a08bd93661007b462010d07314d23628047d82c70ecb93eabcfb. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/DEPI82448990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d18a37e6ff8882b1eee3de798e287b0f3fee429c981db0272a3a554fb1c241. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEPI82448991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157444d8f42b83c6cbf6bd45ebfa676d3a49e090bc56090a470275ac5881653d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DEPI82448993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ba0e741c8ddb488b930db6bb9c4a7fbbc0252927bdf14bfb72bcc9f4196e2d. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/DEPI82450268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfa700b3b1221c6bd4aa16f31377c7e44f268ff631d0462e3b09e4737c87448. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/DEPI82450266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47b048c772c81fb4157fcf8effab7eb2d47ef7ce7c33595a2508ab345da8d41. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DEPI82450267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a81928b7fc5d38b8e58eb50a2a88c7230b11863f2c1bfc19e222070249af44. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEPI82450269.