Alex Rivera (born 1973) is a Sundance award-winning American film maker and MacArthur Fellow, best known for his films about labor, immigration, and politics. Early life Rivera was born in 1973 in Ne
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 0x084bdd430fe99c5ab68061f7904db9501d9e2742085801df90a3607d1f56bb71. 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/b45359ba-60cd-4149-99ff-689c58c0d7c2.json and https://artists.proofprofile.net/proofs/artist/b45359ba-60cd-4149-99ff-689c58c0d7c2.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 0xba04e476fc13b2272b4e883e2c3f7f669b6cae65b19b1abeb2ace89579fa2f95. 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/USE7D1300245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa447ead9ed0bd96ba305ffdbb7ce9539a341604f4215095e083dc7e71fb79dc1. 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/USE7D1300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e85e4285c3c4751b8525bee40d8d24317c9c396d4a62e98703301d5ace6bcaa. 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/USE7D1300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ad68f75aa9895d52229660f18c61285b415c0c47b815774963ad2d7deae050. 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/USE7D1300204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda680921faa39cb2e5fa34f2b1e39eb43a5471c693fb43ab1f3fa1b606819eaf. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USE7D1300205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf2cb45254723aee3f74890ca03eecfaf011411f89f645518956bf58bdf88c4. 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/USE7D1300206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33346bc6d27add0f5e2406b81a03db09fb835aaa7c04091e506d2a315063ffa2. 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/USE7D1300208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0bb757f8c0057f6f1d17708059c3427fbccf2153e68d0474ad56201270a726. 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/USE7D1300209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd778314957bc7f51002fbf311186a8a6dc76cd5dbed7cb280f1079ef9dd7e197. 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/USE7D1300210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65057a386bd2b22ed1858e9e0ce3684d33eee6a07a31e68f2d2f26ef86ceced9. 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/USE7D1300211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba04e476fc13b2272b4e883e2c3f7f669b6cae65b19b1abeb2ace89579fa2f95. 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/USE7D1300245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3b887a039f367463b65eb84c6bb329dc441adc58e296eb7485d827939febee. 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/USE7D1300282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4793ce2bcf3a93a833b434ee0aa3b8c2393ce06039d9d254611568505981f299. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USE7D1300290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654ff0b2cf54d42b7120cbe3ebb16b970bb2c048f5d314854db92de2428a5df6. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZHZ52198873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec96c3e5f048fd7c1494fe1189a979232780bb03446e9ece87eaa05f76b73670. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:58:47Z), 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/QZHZ52198875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12386bdcb5a649dc68f5cb0a378633d1a95167ec6e2710db073b51f778855c3a. 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/QZHZ52198876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2141dbc483dbaf41b7b825afe192e89fcbda879c361a290bfb25c87a07dd11d6. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZHZ52198878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb9498cdf773cd8a0e05399243f6f03379a18683afe0799b45b188f485994b3. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZNJY2130117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84b2c8a91d4471b18b74ec5c84520d0e083b4509f76b5e1de74910ad43ab36d. 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/QZ5AB2264305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda02ee1dfdb015cab566d211c0c6ac583781e8281234962303083fdeb9b3f486. 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/QZQAY2356248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41fd875c049ba9589951d91756d9422d5fe6ffe7ffd44db3ac9b5de3c8d1595. 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/FRX452590700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4d56d8d5b1d1d18ecd62c3b672dfd1dccd99316bb5449c622e932bf5606be1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRX452591141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fff596461f59bd8c763eb0b2af77bc8abda3fd9e4a04b21afa5a4e92bd6cde. 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/US3B90700320.