thumb|Amba in 2024 Zoh Amba is an American free jazz musician and composer from Kingsport, Tennessee. Growing up, they would often play their saxophone alone in the forest. A denizen of the avant-gard
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 0x5b1d0b855c5b0513f828450496b439a6781ad998d74160c2d81013952f73c506. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9407b86f-f489-4c8f-abb8-64c8cca5e251.json and https://artists.proofprofile.net/proofs/artist/9407b86f-f489-4c8f-abb8-64c8cca5e251.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 0xb733e10c7ad0ef4793d59b7cf66b9fc968e749c0f26d43ab63abf838398dd1e4. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/USA2B2201303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25c1aaae11886992e3762138deb973c926387cc74fdd9abee0426e56af158b2. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QMQQH2310712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684499851210e026add6c478526b2d98fa208da9ab5b1d225483e79a479a855b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NOSTS2545010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580f6712c62fe13e1c2d47b1a62d2725a8a709541c34c430636eae6d8c044174. 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/NOSTS2545020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3639a9b6f1903251e652fa6783286c6b32a244507de636195168d71ad32d343. 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/NOSTS2545030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf488e8a67e3f03ca4d913423e8d33e63f229ef26b0bb7b4867023148fb58c296. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/NOSTS2545040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1453dfbda4b10d77d1800f0c036b666289558633c2a3e0bedfa8504c16a56cc0. 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/NOSTS2545050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b70067278783e902e9c81c6d089cc61daa9c11ba462b8f7a17bc999c884fe81. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NOSTS2545070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eebef0300d7336e439baed99fe9aa49677ad3fcb58b6890fe64cda9566f81f1. 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/USTJ22461510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b83a59fd7c893b56d1e62bc2ffef68b675a27424970ec55d8cb365e069d4eec. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USLKU2489001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f324e8ff892d3b6b6d01e5a73eeaeb7a62dd31457f2e9dbb7c9e6945948962. 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/USLKU2489002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa208b2f95fb21dedd9bb2a788216f8f0574839032cf3b2fd29962eec19a4f30b. 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/USLKU2489003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da526518aee78b03c981260c639497ebe5387dfde261778879cd3075742dd47. 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/USLKU2489004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc94f76ea27551d51b2f9fe0437da41051bc107ad44b506532edd13c85d658f2. 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/USLKU2489005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b93881cc7a11e543f2470cda6582be21d3a78b9d44ef64007a5d3717789644. 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/USLKU2489006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa275da24a3f4ebf723d5e4064a08821e255b4689912619bdc198eb3617d43a52. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USLKU2489007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33a57d06e9330df778670b11217b525b4731fb3dd2f9420feb0e29bb17d1896. 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/USLKU2489008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635f1823c89267069f6bd4599d72a6214b74c9a36d878df07dce6ad998054f82. 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/USLKU2489009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f324e8ff892d3b6b6d01e5a73eeaeb7a62dd31457f2e9dbb7c9e6945948962. 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/USLKU2489002.