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 0x33f59d384509fa4bc294ee4c07ba5e09b993db2a1bf9c0e9277ce30f96c688c9. 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/94c4f243-64c3-4ce4-b098-56ff25c17ef2.json and https://artists.proofprofile.net/proofs/artist/94c4f243-64c3-4ce4-b098-56ff25c17ef2.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 0xf2455ce4ff208cd41f7f466f54c79d51c79e594d982d794a3b313e3767eb1382. 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/INM290600504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd486a86e35e75d906893f2093c46df3ae4c8263e05f79a746ed48dbdb26a0f04. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/INM291916333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb4717268c163ffbe465cf13684c8d32e04cca07bb6c4dcef6acd371b4d1152. 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/INM291916339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058f10a1224c5800da958e04ace25d537e0ba0dd6895001bd229e505581902bd. 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/IND292217713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44278c32298a7eaf243454541e4d24bc8164d74278d6d381ac0d5d15a4ae9e4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INS921202014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ec39d8e762fdb445bad073c54cd80e34d58708f4f74cc8c5b20f4cf590a65b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/INS921202017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4069062996303147db51647d30c28b0edf9bf77a010c541c024d7b7f1587ed4d. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/INS921202018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b55d4b484f26739cfb18ae7e50fea08004bd21ac22a0f33a5f5a666e8c848da. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/INS921202022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf553cbb238c8d3e5cce65302a65aee0057162e96c810df52e8f0869590ea6e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/INS921202024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f29e9d74d23a6a5ebe7240a572f63fe9d9b13362ef87a9202fa2e792185a978. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/INS921202029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4543433bd097cd8c8bdbaeb377315fb48f2cc8bafeee1bf5b2c5ac6b497afe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INS921202030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a46aa0210112201ec68cbe3968d159cce98d052858a4b536265dff3a520cb5e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/INS921202035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9befe5290fd3555042ed81f41c79e02acfcc205357f27b858652fa184580eb01. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/INS921101687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd042744506f37a9b80640703fe6134d5877a8c3387e341c5d6b424534e49eb. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/INS921101698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c8e4f83d0a5237fdb789fe25101515d025cdfa9446c9caab89389c9a9f276f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INS921101699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb190c94152dd007cc1429662cd3d8c2af0633a024da3e9c4bcd93a74c8cbed1. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/INS921101700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183971945ffc0c4359c8f309ca0c8dca1986db8c6da9fdfc7818553fe32ae2f2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS921101701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b669ddd03c2f77d8db5b8849a117df7da45bbfd187fef779c952c188e0fc7f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INS921101635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac37a31b2123eda1c9f310da5c655130fcb922c4595588f3db513f633fed4ed9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INS921101637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc94067687ccce0b89a416877e2f0d6d6bce1b82840a2bf63fad4d60e469cdf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INS921101642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a2fb7e62a17d5d79c05ed9e616caae326f890494c4bda9b24593528ef2916e9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INS921101643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851bb9bf60fd93fc968649d169a5831e57482b0e62ebe495d5b28819a8cc8094. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/INS921202003.