First Blood is a 1982 American action film starring Sylvester Stallone as Vietnam War veteran John Rambo. The film was directed by Ted Kotcheff and co-written by Michael Kozoll, William Sackheim, and
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 0x6c1684406840ed3351743174cf8b117ffac8e41b234d5ce3ee9fe268264e95ed. 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/d2f0772a-42e8-4d7a-8275-9b019b5415bd.json and https://artists.proofprofile.net/proofs/artist/d2f0772a-42e8-4d7a-8275-9b019b5415bd.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 0x878817a305b7ba7a099786e23bb82b4f9a10ef587df77cdcf890108b3a692631. 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/USSTT1700028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69280840f03ab83100c905fca4b1922cbb041ebcbfbc3db2f6ae0f706fd2ce4d. 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/USSTT1700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69db339051b6bdae8b8743303da184492bf79664f6d82f84d04494a1ffa56ca. 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/USSTT1700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5955aba3de2fb4f7890c2e095ba4ed51a0e8f305dd3b25fe0a616087be0398. 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/USSTT1700034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581e2aee497841c43c78a3da5355a9b2cd467ef9a8e2a9ac779ed8802487164e. 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/US3441000611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41116c16da3bda7bdc8a3711c90f2a63467133f87bdccee44b4f9db2f1ea58d7. 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/US3441000612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba7810f41e77561078346fd32e1e3f72d8e8f88b4e782ad92c175e7041b7d5b. 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/US3441000614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9924cb68fdb5fef5bd56d86fc98cae126c635cae1728a1c75ce744f0c894b223. 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/US3441000615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd258bcdb197b9701d17cf868714c32e27bd38e3a55a9d5093179adeb9d1dcd8. 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/US3440607601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c13750a95e0b4b3f55857e7be22fb36c9292c203688bcefca53d57e981ab6ac. 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/US3440607602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ba5bacc74b8883d025f6c4cf67ef9e6d1e0d5da264d4fb1813499f2d9782f2. 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/US3440607603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d6ed52f208e35d9615ce5b54d854bbaa9ce376fc694884b306a62237bb9cd3. 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/US3440607604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb04857a725d17ce7171d8f77f218e3707f2abb6185089f41265fc92fcc5e68. 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/US3440607605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6283ebabf4ccca33ffb68151897f7605b6e91927884b2cdb45383bf9cd4a27. 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/US3440607606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c18ba15b2dffc681530560e4863ea7af8ee12a58eb0e30ccd2cd2ca1583757. 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/US3440607607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a3f76a2ae7daf8f2e85aff892ffb6f1e5de86f8dfcf0ab9d0b13dc04b3112f. 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/US3440607608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8305a748fb087e2add1877edc78febe95e4ea0da708cae0a0684b6087980e5. 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/US3440607610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e66fc1bd2ac52d3cdb8670f1d4d030fc47e9ab37ff6ff8bbbfe758a0bd9836. 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/US3440607611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878817a305b7ba7a099786e23bb82b4f9a10ef587df77cdcf890108b3a692631. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USSTT1700028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69280840f03ab83100c905fca4b1922cbb041ebcbfbc3db2f6ae0f706fd2ce4d. 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/USSTT1700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69db339051b6bdae8b8743303da184492bf79664f6d82f84d04494a1ffa56ca. 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/USSTT1700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5955aba3de2fb4f7890c2e095ba4ed51a0e8f305dd3b25fe0a616087be0398. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USSTT1700034.