Great Grandpa is an American indie rock group from Seattle, Washington. They have released three albums on independent record labels. History Great Grandpa formed in Seattle in 2014, releasing their
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 0x5e65b03a856ab9101c2967718e667b31de76ae3adf30693b8f350ec9a3af29bd. 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/1fc258f4-7fca-4112-90c0-aa696d683985.json and https://artists.proofprofile.net/proofs/artist/1fc258f4-7fca-4112-90c0-aa696d683985.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 0x626e701ece917c6399e85c792ce4ea568dbc8dd401e305acbc5a0e5aacc0edb0. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/SEYOK1608163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4b49c117518adc867ab236a42a05af532ee38694cd70fe70ba338179345ee7. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/SEYOK1608165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b638b717531dfddaa3c71d8bec869f255846ead0e28481454ba61dec2a1df6. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/SEYOK1608166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb345e33ced2f0321c49c022c719e6b506a8b35ed2ec6aa37a27612fa402fbe80. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/SEYOK1608167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a825104c57d9fa7ee82f2ba319ef6e270ef0fa388dbac8c45fd08d227d98549. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QMCE71301402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8173dd82852f192d515cee259b81a98296a3692957129a6d8f6394b1586a4a71. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QMCE71301405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001718d1f3bc888dc453cd9cb37481307ed4de9efd7f5bec5e8a294a5d798ff6. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:37:07Z), 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/QMCE71301406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5430ba011dbff8f6b07857af0f5536137341be988e4d25b5106b60519162eac. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZAZS1906503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca694a7b4670bcaf3ec6aba848584be5ee10d4a78a56f8b86a0cd7cb674c095. 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/QZAZS1906504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ed50db876688e16f3af4ada5e502702963f7b699f6fb069990a241930c7ded. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZAZS1906505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe109587a50f8add0c178ae32f79ba3344cc040bec99d81ccbf6fe9c2b20536c. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZAZS1906506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0aeabbfef6b8d7a0bb5433233b41483e449a1bea3a3d9d310cd02dda0bab3a. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:00:20Z), 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/QZAZS1906507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072b394fb99b9eceb674db17bf7e8fe5860d619868d6777c5c9879ce90a96d31. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:37:49Z), 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/QZAZS1906508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d05390c9f658782bd1ce190c1f96bd495e9b8b895bd091da32a3390276ae469. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:20:25Z), 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/QZAZS1906509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bcdc0a6186974a5aa6050e6bad83ca02607ff972c7ddc8dd6332f53a5ed113. 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/QZAZS1906510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed12b6218dbca705d58dd59813bf52cfb81782519edab3b897cc6c86a74c25d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QMCE72527707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbe9bd5c3ca7efbca63ab4cbd0c0bedf54ba82b137e23206a2fb78b4360241c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T00:38:44Z), 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/QMCE72427701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc42004646d51fd4e15cd7b3b3012c27855d3abf8a11f4880e83f8d16e5087e. 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/QMCE72527703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8a2279e985b2bb47a9b5cdf6d7bc587add114d3f403d9c8891d9532dd270d9. 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/QMCE72527704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d345943ff534fd1156687f21dcc18dd89d8ffb90754f047d8896c296eb50e34. 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/QMCE72527705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed12b6218dbca705d58dd59813bf52cfb81782519edab3b897cc6c86a74c25d. 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/QMCE72527707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd547393af23bc5d80b00708b1b9dea9320623cbb1b9336d0ed05e32644a14b54. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T13:22:08Z), 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/QMCE72527708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec54903c0bceec707ce4cfa1cbd51cf725d6c197e1db328d5dfd5cc1bf621309. 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/QMCE72527709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bcdb776d3a0c66cbf520cd29e72f5c656da0b9f6f0e0d5c4abb1de5e1ba9e0. 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/QMCE72527711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cb4f6813125750e517a4f005afa468e13aebf449e17b70c6eac82f888e9265. 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/QZAZS2107810.