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 0xc0fb30ddcb33b830052a7254cb2e7afda9fec7315e92ac7817c66de7a43d2a84. 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/236685e2-738e-4cdc-8723-e778b2e3bf27.json and https://artists.proofprofile.net/proofs/artist/236685e2-738e-4cdc-8723-e778b2e3bf27.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 0x8f7f420a1ffdff6e0cdce3f6329c146b2c6aeb5311dcaf8495f7732d220a6d3c. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NL8RL2429800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08416f4e6207798149e9f535f4f6853fdde3a93913183966a1479d9e90307a6e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/NL8RL2429829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa164a9153edb92fecb25c209139c5558c350471d66a2932150bd0d043a4d1495. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/NL8RL2429836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2cf11474044bb43a7a66465593780ef8dcd32ab5c6b51731ec49e29974e8b0. 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/HKG731625493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9299a80f43709cb8be91f61be3352bad141f95cb9f2603a68eb90187f90daad. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/FR59R2254682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c70faf2f5e24671fc7aa37744ecc0d65361608fb3c8840d30830370f686b6e. 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/HKG732429614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34896ac05ec221fb49da192456435ed123b5d2051676a5731ed209ce364bca8. 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/HKG732429684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3b6aed2cf734c050646040e83dd8f13d981e3343d4bd5a9b53bd209f0323ed. 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/TWCT52435584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d6900592831736dc9f303872705c03c9a37f4b1d61637a1bc50aea62ec7cf3. 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/TWFA52400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50b3af03f65be9fe784ee7d2569147f5b8ecda30c248eaf8f1f3ead1475db88. 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/TWFA52400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4919f9d140f32464155a716a5c0e0da934d7e3bca3875ab43ce32943cac9f27. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA0R2482027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2804c874be6cc79609273f5eb527e807a24a7caac7a26eaeb485a48aaa16b3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732425222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8e5bd77e6074dedca15580fcd27d604747ac352cb7a2402b31ab5b2f244c5b. 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/CNUM72400540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6d8e8e4fd7d97f0c22eb8a0a664c378611af435d62f14d0ff8cf0e7d149963. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/HKG732425223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c90691ce7aa7470c38b0401152a221cf36c4b3fe33623309e5db6505db4ec6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR10S2191667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedd2e6d3e459dbb15731475eda60263dec0501d1b6ce876486c97c05c88f38c. 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/FR10S2191652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99806aed646f8b1adba6d505f2c5804d61b460cca97b22040fb250268030aec1. 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/HKD012301130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c9f485b5f88f70b5f4e8c8d13ab9f7e9ff551611518004c6b341b67c85ae8a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKD012301131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405cf4613068952ac83774b688be5edc7db38d203cdc9290efafee22cc543e6b. 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/HKG732281597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eff1efaee242235a9eff548feb40581ba29b76bcf49381c85c1f8077ba628c7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732425205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda751c8571aa7ccd8cb38ca928d5810b636bb09b4af8ff936801c8c5c5983d87. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKG732425206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46a973261d5817436d79083551c2150328b91b9a05baabdb67e4838bf70a31a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732425181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa642bf1f9bfe78d715a4335fb5a72efcd01c0949c3f26558b162f85005d5ae31. 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/HKG732425182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85434355804ba99f5f848e99f63f9550df7e081e3ca549fc9450a95f36ab5996. 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/CNUM72400644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad1d6857ad2966e1e102699acc644606047c1ee26f51451c1c78849b1ca3f06. 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/CNUM72400650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230ebe46fc98b978f658c06831fdbe8399de5c6deb1ac995fb4b8fa68619d115. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732425195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5d43ef779e554609949bf7b1476785a83bdb72d3d42dabd5f8337f723b9c33. 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/HKG732425196.