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 0x796f823614c642131ab69e2199e21621cf986de959db4cce65517548c686cc10. 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/85d244f8-ccd4-46b8-b5b5-92d26f8dbd13.json and https://artists.proofprofile.net/proofs/artist/85d244f8-ccd4-46b8-b5b5-92d26f8dbd13.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 0x6c9cf2fb2d0482de56336b37d4442f9bc5f4efcf95ed9e25239455c83baf33fd. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USL4Q1993162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa81efecee4ef5337e9b0d278f3bfcdb1eb29913efdc50d19ef1e2636348cc97. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/USL4Q1993163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cfa7d66324cdee71c0e59d5169496fcd6ab0120c029cda6e198cfe6a050f6b. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USL4Q1993164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27fda670a57e5ffec9b90ca7c5d2a7af73301fedb3e547342e16723d6d2d3f2. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USL4Q1993169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb635758d3ff71ac807c5150b42a6accbae3e4a845ba253f1a0b499e76ad40dd. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USDY42122388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563a183e63d18f85cacc5175614e57e16d4b11b2c77293ce79acf456f1a47054. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USDY42122389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c05aa2a09a806e11f4fc5ff7d71e3c720d7845d6acc4d3e643c28a5524b1723. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USDY42122390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c7961bcc0405f1389e76c435d7c83f53d3a62a7351134bf0b5ab3520170b91. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/USDY42122391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a212ed05d3ad71a8d300d3e55580957a8edb0fda1b18eb3d078c313e5ee958b. 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/USDY42122393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f7fb17e0a2b69f373018e1deb0016c2759290def2a04baba50c7f42df0524c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USL4Q1994637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f73f548c9a25ec71f6b783c94260b52f9b09dbf010f6685072abc6533b9a948. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USL4Q1994638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d053222b26bfa277f95b2eb0443e699b948511d72b8e98ede22bbbfda09123f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USL4Q1994640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b153ff64df3219965c8c92689b5f796fb0ede88e357d7cbbb5b6112d7ffe3b4. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USL4Q1994646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc385ef1723e1fce0eb20eb28323f9eec295afd6bcdc18e7b44d9d3e0b7ab16af. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/BXPBN1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629deac4b4e0c780f934c61341482c0191e40b57cf471f7448e6ec19412e6017. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USL4Q1994636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f7fb17e0a2b69f373018e1deb0016c2759290def2a04baba50c7f42df0524c. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USL4Q1994637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f73f548c9a25ec71f6b783c94260b52f9b09dbf010f6685072abc6533b9a948. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USL4Q1994638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1c00cd294fa05c28e88e0e18a6fa7b11ff7dac369f218a396bc02e51e22b4e. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/USL4Q1994639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9086090fb9b4e7f7f7969c350cce997bedefb1fec36b5088585978ae44639f. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/GXHAF2579966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f86eac654cf0313fdd660a877abd3aa71388b07747a120cc52f58407f0d15ca. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/BRTMM0500065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19f65ee7939e255aee426eb6be6d97fc1ad321f030951d14a9081d628c53e0b. 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/BRTMM0500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60eff2a2690eb40a72127754e89cbbfa861a7a3a91f7f33b9d3e08b98d19d8a1. 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/BR6DW2500002.