Pentangle may refer to: Pentagon, a five-sided polygon Pentagram, a five-pointed star drawn with five straight strokes Pentangle (band), a British folk rock band The Pentangle (album), a 1968 album by
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 0x152a1ee45a07210f333e2adf9c32486b037624a6b216c471d31f91d76f1b4889. 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/c7728c30-93eb-496e-8559-5c227aa46c40.json and https://artists.proofprofile.net/proofs/artist/c7728c30-93eb-496e-8559-5c227aa46c40.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 0x81862dc05aa3e967c9d6f90c6e51fac34171d8aa714394abe39ea1132c242bbe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GBAJE6801054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24831dac2a1a9f8c34d93db031721f6225b0707fd64ebb834340f674a575534f. 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/GBAJE6801058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa102b6637850d4f0ecd64488ecfc6f9c66866fe1cb506c5b5d8b63607641c0ae. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GBAJE6801067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ea36b0ff98cff958a131e7b481948d407b6e5775b1ff9bf2f99efe05e90435. 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/GBAJE6800118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56f6f396b4a2310facee4aa9a087ef7652b19b523418c39c599d295fc012935. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/GBAJE6800123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae12c26d0209c8ef7553bbc3bd2c17d5797eea81ea66000f62a6cb8345cc389. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBAJE6800124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586e6dd10198e1acca8a3b2ae27e063eb6dc57156fb92df8720850aedcb5503f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/GBAJE6801069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e0d2e5db207cea8aba230293cb428357a4fbc25923cd3ba060ecf6305b2b06. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/GBAJE6800127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4389a911e3e7d682dbba561f698a2202203a90eebf6fdf13ce4434de34d6acf. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/GBAJE6800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc17cd908fda56705df71f636594428ba3f6962cf8186458704f086327f3af3. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GBAJE6800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d17eb2c8e69d3142a75156c8f729db038ed3426f2db7c9f0f43ac7e22c741. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/GBAJE0414237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ef9e417d34a09aa3db80f49fc37dc5e78c0866abb0c378f62aa40f17742c1a. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/GBAJE0414241.
Sally Go Round the Roses (2001 Re-Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb76d6c12eabe99c9ab8c7a37ef554139997ef7a5fd02bff5077bfb0cd2b1151. 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/GBAJE0414242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b074b1eab8cca58670db7aaf01d57d981bc5a71c365cb169207d028bcbdffec. 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/GBAJE0414244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120e40781194c747baf1e46c5699ca5b4a492e29c9d1414e9d4f6b8f9bc0bb49. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/GBAJE0414245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca36d3160ae6e0f4fafdef2309a986f50ab7c49fb203936c799ec5782be50e9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GBAJE7001138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2f50cf5d7fafd7002817be6237722c433033ff26541e0251ad211b7cedd2ba. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBAJE7001139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ba826249a9e4781d6d355db4fb8efc82ed38649b493d613460dd40f48fc556. 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/GBAJE7186300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31abd3f80ac5b916f685ca1b09fb9264a88e017b502fff15ce188a5dbad2241a. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/GBAJE7100864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7f1cb34d7d6d87b91a601e5f2a9fd32ca521b986ff695967f83a5987a76768. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBAJE7100865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3649cb87a1a8cbf8b8b2720416c632594927cca87533859960df61167e42e67. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBAJE7100866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44343772cfd70cafe868c29de7fcb907c3defa5cc6a9ae919dc159c11a65fe1e. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/GBAJE7100868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf59bfdf4bca740b9e8dd5bd33ec5ed3ade341c596996ffdd0798f5c368373c4. 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/GBAJE7100869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cf809f2437acf981caa52dc731889084ae48caf4c93562f07aa8eefb6455f6. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/GBBLY1705588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a70d1d945678ffe3a80bf8abb493b6ada0a281529a936958ff8861463c2b50. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/GBBLY1705589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f1f75c8097389da9ed57f17bc336144c6d2be32669383acd40534e8c1c9203. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBBLY1705590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71caa7efb03519867a730a674a5f1b79ad67133dbe0512672afb5500ae241fd. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/GBBLY1705591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c8f8ee11ad8a4137c70252ca741dad0eb89518ec5432301af1ffa230ec99b2. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/GBBLY1705594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36171aa653d59f96e55a0122a5054f9140e4024d397519de0c0a3b6e3f8a4f43. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/GBBLY1705595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa492f7fc704def019e3338f39709ca2d6c5688858c9b5cec774ee711b6081a56. 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/GX4G32100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee73da691fa72278ea54955d83e372130f384b151c9dd99eda85b3558e7ca197. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX4G32100013.
Finale: An Evening with Pentangle (Live 2008)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf988a42d85d02d4dae723ade34edea94b6750ede9714f91f57728d714a09bb94. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJE6901110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7deb36e84cc52196d948ba9755397952d68df7abffe5bd8ec8fdcbf869abcd63. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJE0414240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eac2b8ff98da9e51b2062021099a8ccede895315c25f754854f7c95a45267d2. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBAJE0504444.