David Robert Pack (born July 15, 1952) is an American singer, songwriter, is best known as co-founder, lead vocalist and guitarist of the rock band Ambrosia in the 1970s and 1980s. Pack wrote and sang
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f1d1341b206c5e860b50a7f64fa3bed27a420efd3008b6f48927d6aca719c1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/721dc2f5-7f5b-4bd3-b67f-d5adb336718f.json and https://artists.proofprofile.net/proofs/artist/721dc2f5-7f5b-4bd3-b67f-d5adb336718f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa81140622a606179fb70e365ca893670c05b4b7d250d5eb6a97a3c026b1d8d8. 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/USWB10602067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5214090f0215e16ca79e30a91d6d686fb10f2727109ea4f5bb7cfc8e766cc5dd. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/USWB10602069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae948c5aa2d69b2be95a761d7b1f54fde9287057d5dc32b3bf1c14421789bd7d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USWB10602071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08df148147eed162cf0ad856cd52af06c200f0d78cf82012c50480e6b9438a1e. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/USWB10602073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5d4ca2d2b550baa2ef35fb2068ec374199dc7cbb4e94dc99ac5b30edaf83c7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USWB10602075.
The Secret Of Movin' On (Travelin' Light)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a688179b100dc133fca09e2a8d2108162f7df56bb04731fe9d3d811b4d200e4. 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/USC4R0506120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ebb876d6dbcc6db7265c5a320b8fcb1f60049630733c3fc7e0149f9db5003b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USC4R0506121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd7e2102efc47188bd5789a40e3d9cca64d2231571a22e16217b02e988f64bf. 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/USC4R0506122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0751dd0d9eb65802e584641cf9e0a8ee88790987b587d6282bfaebf3313da33f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USC4R0506124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1405a9779e408784f260fb547e286b659d84c6881ae58d30c04f4a64af1a6e. 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/USC4R0506125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968f3a87de5df7cc61280e36af7085175d3656d8f902e648eab5ce840720cbe0. 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/USC4R0506126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54d8c3dbd914751f0ceb3ed34c6448d899d2e02290ca6b900824cfa12fab159. 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/USC4R0506127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61a802ed4f088e2f3579feb89195690c892ab38a24c1b5e0d8ba3df4563e827. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USC4R0506128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefa63007d17a10d54f5e739641995799b60d4ab4cc29f409055cabaa37b0560. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USC4R0506129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7030af7ee53b8877568663e2f1238b80a0835e232716dbb223296ef8e3bff192. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USC4R0506130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c635d038833006de1d6e233b1fb1b2e931557238b88bc5c1ea6dad90a83eb3f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USWB10602068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63ef4569b9a4097caaf82b98c688b43a8860db620d3dfe8623eec530e20b046. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/US2R30518401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c958c3ff359a56c652b9b6955e917a82bbecc2b51400b29f3247ca014ec48c. 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/USGR18800039.