Robert, Rob, Bob or Bobby Walker may refer to: Entertainment Robert Walker (actor, born 1888) (1888–1954) American actor Robert Walker (actor, born 1918) (1918–1951), actor in Strangers on a Train (
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 0x4c21df33b8510404cf2399f816125f393bfbf64da758a025c45a517ea1429235. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a11400b-50ab-4833-b058-d4f99c90aa3e.json and https://artists.proofprofile.net/proofs/artist/6a11400b-50ab-4833-b058-d4f99c90aa3e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xbdf5e0a69d5b27127c8ad1f641522e51cd12028e02a2399e1796bed505387c73. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USL4Q2023811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd864304ad81b012aabbd6b5bc64ea17725961e0b6796869a85214c33e4ed4af3. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USL4Q2023812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ca758994773252b73bdf9d3c03a0d95af12ee0bbaba952e65ef43f96282224. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USL4Q2023814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2512c2013f6f129553bfe99c0075d3216bdf40ff5546fcff3acd1f1c77f4ee3e. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USL4Q2023817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57405fb5cfed5b5398218d63c7d47d3ef63facf7e0228b5e94aacb0e746683b6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USL4Q2023818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a88dd614b291afab87ffb976888e6a5628b6a57b5503e23764bbf62551e791a. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USL4Q2023824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5a165412ffecd7cb4580545ab766fc40d7ca9f7b3ee79edc468608954ff030. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USCGH2124578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ffafd508787d37dd1c8f9bf79ef605df6c0de05a007b41610d1e58e415aeb7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USCGH2124579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6641ae579047e0b4bac69ce3a96586c4ea4a5f0932aff74b8b3cdd6a2d9dca61. 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/USCGH2124580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd012e5a51593f48561e0e99a8e1e7d182ba64bee1b3eccf13d56a2676def30b9. 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/USCGH2124583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf145d1473180a9b1aaf6c9ec91448b585c749bfad7239d19ce18dec0f71c39. 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/USCGH2124585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0d60b7342c989b95096d2d441eff7bef3baa04cb49f9c0cf2ff67e8151f7a3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USL4Q2130002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96b37d84998a4dab2b2b266294b2c93793949c97518b768414aa223477c73d7. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USL4Q2130004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9518fa78d470d5b7f23619b21da89f3ee2ab3bff24a628a93f8671301758fce5. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USL4Q2130005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd963f3fc722e508507deac77aa189ec074ccf0eeeb535529e5968891519e988a. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/USL4Q2130006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556fd195ae8e8c19c9f2765a543647cc0acce8d7a3d4e47aa87017cb6a65d447. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USHM22204611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbc5893bb917829d85f84e77ce557e1f6136e67f2e9fee146fe0e7514a69569. 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/USHM22204614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4162e197f05e6184524e2c5e3f8d99ed7f21c1ee83635e03f8d9d298dd1c69. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USHM22204619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0865419f7243564cae6a8b40a63b3d23642289e25862f0c380cdeb4eb6bc06c6. 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/USHM22204622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa85fc3a36bd18b7bebe45e2ea0eb76aa3e6e7b1ed7b505a616950b2728b8158. 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/USHM22204623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f630d7ba03dd127debb374e1cc40c68633f4b49cc6211beae4d1baa7ff999ed. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/USHM22395923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88396dd650c397d37ce171395627fa0faebed45af400d6edfc9eae994a1b6de8. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM22395926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a14cc217ccdf8d0fdf8dea83b193c332daa3cec2e398e2e521f7a2f8cd04195. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USHM22395931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34d997a2d0cf828baa89a67deaf537ed78f96eadb7e67c250e77dca08d9f08b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USHM22395934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114d1e8fc558a4b2594fabc9f2dc9d73cfe83ba2450356aaec60f841786f7e06. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USHM22395935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadadb1ad41865f19cf466cbd13db31ab270681659721cec590cec21bc82a88b3. 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/USCGJ2480140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff5a481232a5202871a1e7e13350cd0ea24118aaaff7779d4618075eb51309b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGJ2480142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d02a458fec7255471dc657aa2bd7f54c6af9ebe4ec8f034e6f3c51843ce6f51. 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/USCGJ2480143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e70f0b78a21e947beba5fb15a17e786c8e46b9fd8ef4691060efa15400a82e1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USCGJ2480146.