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 0xc9e98b609b08b3f7fad8b4e00ba881201f9a426be84c936b451f9bcec075cb8b. 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/2b0e48e2-b6cf-48d8-9f3b-614a5efec017.json and https://artists.proofprofile.net/proofs/artist/2b0e48e2-b6cf-48d8-9f3b-614a5efec017.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 0x16cc8ccb12cf49afa5945d39087164479c09f82cf5a22764febe323cecc2261b. 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/ES56S2200740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8479c5fd0748f5b8ef2e2fd10b7f7b73eb57775aff124e65a2c5ea67d1f9bc12. 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/ES56S2200741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e7ed745385ec069ea02401f9ecb3aca81a5b68e9f1e76a49ad7eaaacf70645. 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/ES56S2200742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499fb1b6c2e6923b07870a3aa1fd6a3fb19cfd221543ec58f2c5b8c16593052c. 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/ES56S2200743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e93db0408838300bc7c4ec60bd7a085937baab98d04cd9a6292e4c1d3301a4f. 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/ES56S2200744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdb9ae1b934fa257fe14aa7c68fed739d09321512b4a262437d25e0d4d0129b. 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/ES56S2200745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b370371fa723efcb3d433652a0f3fa4192ac011eb85b8ea7fbed230cc6270e1. 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/ES56S2200746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddeba254a64fdceea85a32d0d0c2c19489cb95994ad539d2687a083d64c596c. 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/ES56S2200747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16caeaca579d593ab86f7dbf408c6018e942bafc92724ea7d355eaa27194542. 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/ES56S2200748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8f7b762a40b118d882af5b2e987481c601ad766762d70d72a1a38964774997. 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/ES56S2200749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dddd3d57fb27b24e59d574af38f427f1391c00529dc526ce584e7bd2a6e3f4b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES73F2400522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc93da362f978b9ab7b1fd4ff1f9ad54c696166e10cc179b8cccdd80c77c10a4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ES73F2400524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559f5b40aef24831a712aa65a66cfc35f0ec607acd7ed87203e90c9e305ac450. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ES73F2400525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1366ccefe82f53e26e882fb91f0465d7b819021afd4496fca31af9ec0f3c6c4. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ES73F2400526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542dd53cb06b0dbc99884ecbdae58a82cb7a14870362a5a969fa7150657018a6. 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/ES73F2400528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a87b32a48443595506104b2d62d98d8e569dfe6ebd45cc814e518994fd02dcc. 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/ES73F2400529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32ca940b37a3d8be7d05a9f69600e5bbfb73e50a96c70266d70a63d8b29fdaf. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/ES73F2400530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa650852dc3d9aadcbd314f7bab64d973a13503f3488d5de372070d13d620e6a0. 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/QMFME2248449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3028179b5f53c8ced91c494dc224a243d4d17eac741b4f29cf41ba389c267d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QMWZB1910973.