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 0x083b9e6af9dc9648bbb51cbf8c4947df8402f13e3b075c0927aa2dbb71aa7037. 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/43796ce0-1a6c-440a-aea4-08bfa4a9dc42.json and https://artists.proofprofile.net/proofs/artist/43796ce0-1a6c-440a-aea4-08bfa4a9dc42.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 0xdff7160b1f3cf9cadac11893b37f5dc6947c6d153e24375effc64b5d4190601b. 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/ESA112448341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471b3f0852b5bfe5225827791c2fd9d3e92181063b1a4d23dacb526ebdd7bd45. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ESA112569978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66922d40d7ed906a6ce17ca180226ab26508349ef337553012325225c65f911. 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/QZMZ92578235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee2bd566531e97d8346a0404163311118d80a475fa97a5730fb2dd0933317ba. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ESA112567724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36a12f8443f172197e656d1f9b701e43efaf9b9253b5715b462cc51db0b8f2d. 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/ESA112567683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3c09b0093c361f9ceca8a6da8ab0d08425f253bebfbbb00d5558ff01d8f62f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZMZ92514969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7741bf62125e0aade3f804c0949f704656d2018cf9f3565600d3c0ff8d3306. 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/ESA112564556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141f0876c1e4e36ee1e4f117233c2c3b7cf737648c1235657f869cde6c897036. 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/ESA112564389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912651cb4426ea0094d5ab5fe8544f0e3d33940da4732ef587818c8b738ec240. 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/ESA112564390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5ca2ad3d5f2351e820da718281defc521663d1afc071c5b877afcae829f1dd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ESA112571673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dc7036c31e076442896efdec15874d1018defbbb1e3b203d00aa3d3df2953a. 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/ESA112571883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0680608945fbf39feb245e77d8d863b80f736e8ecdf81b2ab54465b4b3ac144d. 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/ESA112571071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8110e2f3d36cef3edce301b1cb67f7a6f451fdc69f60cc1b12c0a1fdfd43597. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ESA112565148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc763030a8de23372286f40207c7f5cd971aeae1721e616da6aa6067d0413a4. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/ESA112564388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4882f2aa29faeea329d14b82dc4a0122ac1c321c65c0363596b64633459810. 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/ESA112563918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06efd2102ed2cfba3a26ed639f4d332da49015e8c416e127f29489ea862a166c. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/ESA112577129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7aca20c5ae4c6a4465983c87a85f69d707d6665b6ecd76d2d6954bcb758466. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ESA112577039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186fd0885b3b7dc02bab48d1e2f0fbe1693f01942ef2ab27b4e2fa28a50aa368. 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/BXP0K2400985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc26a49ffad27d23668ec566d50ccbae0b4adc804291fab0a76cf43fcb6fb5fd. 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/ESA112573161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897299f0c13184cbf9bc6a0dc1dcf3226a07496cecacec29b892a4a6cec944a2. 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/ESA112446416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af026910563d4e1bbc83f7cdcc037ed5d68d2f38eed520528669f0847e46342. 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/QZEQU2214213.