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 0x32bd27007e598d0f3bd7d74b8b303b440aff0ea81480f52753a5c29024fe6ecf. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63b24bc2-d42d-4c5b-b3df-ea940a2f5c70.json and https://artists.proofprofile.net/proofs/artist/63b24bc2-d42d-4c5b-b3df-ea940a2f5c70.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 0x84acc330fdf8fa1e204e5a89164e1c4daf37c5ee21de453a4c25cd1c4193aa87. 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/FRX872103004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf08675491cd7d0d323f7eb91531f2fd744a5790c77568f096f7e991bbf526f. 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/FRX762185229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0d33745319bcc4d0268d6be249b1d276c9ec0d228f5da7547acf9ff945ccba. 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/FRX762178851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c0d46f31f8af5e7f09597e64ddc0c5784246a243be1c8532e028ef7e302af9. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FR2X41970673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc42be04a8f719b61ffeeffb46216dc7d456fbe4bc77c8e3f2ac5b0c162cdf4e. 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/HKG732112979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3025a96967d5378e110c8bc8848cb89096d79da60e60bba883a3c4076a192c6a. 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/FR96X1840785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8088970ae873ce88d1d7b71139c78f03e94661f4e202b0f03dd1cd57e30c2d02. 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/FR96X1898267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37aace6eb5eddd3b627ed8919c4b0a6752f86881a03390c6944c04cc38d30740. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/FR2X41963186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16115209fe40541063b9f0d27ab0f9676f2f7c4fe7c373de1ee556399f49047. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/FR59R1937687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c52c0de9f7ff851cf2454cc1809ded5153817eba463a28bd0296080d9285fa7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR96X1914662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8040b974130b8a0a6039ea65710882dbb33b88bccd84be9b3f3e426872c5ba2b. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/FRX452056588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e69b4a22fa103738077b0be23f30acc0f2e6f19a0cb1c1ef8b2864ab5a5f92. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX452078956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62a3c6bfc7cd690acdda7ecd6d7ec53175709ae5ebac807d5804dec3ea9069d. 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/HKG732509921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f01a277674506071c3923bd47dd8da3d122035a8422594784846644dc2ed11. 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/QM4TX2025726.