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 0x256d45015a50f58a93b661cd20dcda271aaadc04436da05f8b075742cf0799a6. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/101cf05a-c9ce-4af0-a16c-cfdf672e7d4d.json and https://artists.proofprofile.net/proofs/artist/101cf05a-c9ce-4af0-a16c-cfdf672e7d4d.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 0x8815cba0c8536d669b9878e3056c5254df9ad02dd97286032974a038ed6e488e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKG732450443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb4cdeca0e48d990f9ecde4414792414b031dd03a9f50357d38a32a6e24b9b9. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKE022258053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43c6582cac57ea329605bea88fca8452b9538383da7ebaa48141c2514e8ebae. 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/HKE022258054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35150df6a3a9f1f0a7b0febaa94285b78e08c7658bd391ed0622780942d408b8. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/HKE022258055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb493e53de6fe0b15c4a15f067227aaf57c5877b59631d64959887bbd1db57be3. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/HKE022258056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07d19b5e964dd3ec2502ba21f9e715f6eb7250049007336d435a972e19b63a6. 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/HKE022258057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d90a0b506bd17db48281c30af5ec7e6238ca645e750271b28c1483bbdeefb37. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/HKE022258058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887370cac7f2b53e74dd07a1f7e210dda048f2d484b38bad477ba4cd3617b399. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKE022258059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ec2c828c68232ccf6325882f0e84f85400beed1246658dc0423ff1d5deaedd. 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/HKE022258060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060011eaefa8ad870fe77c5e5b84fe209c88ecd97b22fb38c4304d370e016339. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKE022258061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b3a8162f0260b31b5e7330ca8435fbb8d0db1ad93ee55b4de921e2f61677b0. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/HKE022258062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f27c268fd4c8ff801bd69ace8d55bb7d2a2743cb0a2ca2a3573ef0eb5028f64. 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/HKG731857020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acbd5940610b406df81fb7643596bb407391076f4d5ac100944c7396674b2c9. 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/HKG731857022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fac1a00b0c3ac699447126dd39c3843ac699f1da5bcecae2a74d1258143fb8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKG731857030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f78c28b35aee8ce8b30e322584bf8f88988c0c6fad99e2c02a6ea7cef1d5519. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR10S2211875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcce30c4539fd1191ead46edf719c621058e07bee74bd1ae735bfc89133a8ad9. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/FR10S2211883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99d9fafec0a2c096a075755204fb99c55388b9b52ed1d64b1c94c7030f445c1. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR10S2211884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43ea73993d32d828025010d117624162e38c2ce6dca73c6c38cef8ac8783419. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/FR10S2211886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a09340a53e4a33c3bd0f224d194266f7ab93be66e2e34af01edebe22ca03b4. 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/FR10S2211887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f636f7af4d9b9393b1bfee14ca991000bc408469530c3555d5b1ae6ddf8b04e. 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/HKG731624488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45c13ac633ce9c121311d2b84fa387213be44821742bd4a2535edc1370491cd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DGA062405447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd893ef44aa821ea5503283299a7ee67c3ba929d2b780d7bdcb565a9556078f6. 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/HKG732410147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e1c42cac2f375897169b20e0f92bed93e63779f9ee67716a2cdf94a0d9ee84. 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/FR96X2212458.