Black Guayaba, often spelled Black:Guayaba, is a Grammy-winning Puerto Rican rock band that was formed in 2000. Band history Lo Demás Es Plástico Black Guayaba originally began playing at local pub
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 0xf89b241211958c2c558d78b28b944905252d19decf63f70f9c2d6559387512e2. 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/e4088ece-2697-4931-ac51-8a5266c862fe.json and https://artists.proofprofile.net/proofs/artist/e4088ece-2697-4931-ac51-8a5266c862fe.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 0xa4bdea61dc7cdd8e4a17002ad4a27123316fac3fad871ad070330f2bcb19a27e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QMR9X1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe116c7796c9d8622de4aa8c6b962427fe6c285128284faf26040c743672fff1d. 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/QMR9X1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3221df9a7116f7d552fc50a7fdab1710f0bc2d6bf7cc8f8cfd53ad7aa0a10d14. 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/QMR9X1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdde71b267507959323967c9366607608e4f7914fa73bf8a151261555c9eacbe. 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/QMR9X1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124c7f2e573fb7ab5d16148ca9628bdb134df45ce801d9278c645bfb4a5f1625. 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/QMR9X1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218a069e47e4c3e2adff503eb48f6a404fae934864755f89781290afdcecb23d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMR9X1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba24c4e628444e0847a9c939cbf12a82a796b18a6c59a9dffc199e3bb3d6afe7. 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/QMR9X1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c573cbdfaec0e8bee2cbf332e0eec72796fcce75f4c43bd83fa03bd7bfa00c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMR9X1200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2d66d83b587a62d0aaf9a62dee8fe4095241c40407fc14a6974bf9299bea63. 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/QMR9X1200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b83248f5af0cac4a35e94e04d6b11e6e7fb56fe2d800a746f6d3084c570e03. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMR9X1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d683b71e67156395d714a864ee19a12bf21d67e1bc1079213af3cbaf8b0f9e6. 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/QMR9X1200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7678102c5269028cf4cbc633d8bd74ce32b7f97327d4122c02387846d8293d90. 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/USUM70744511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389c3ae436c61d37c5b3297b37ec63c22c886e39356e711b92120e4bab0452ea. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUM70744513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbb6a3fda8d3c1106a906ae2a87ad5f2375eaa7ff8856c4fbd6918e0131d3ff. 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/USUM70744514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e494c32ffbdec83fd2fc1d0009b104221e35638d6893e6cd1990a53c2ef09e. 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/USUM70744517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9feee3eab507e5057465b6c1c2a531a65bf72f8766baf4f901ccab3a563d884. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUM70744519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0754629ace25d979f3146b41f56091b76611d14bf3fa1d6dc134f8e645166e49. 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/USUM70744521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe570ad18937dced06c6d08248c0d28abd4be914b2ab30526cb0579d4487cd3dd. 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/USUM70744524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe3f5392c10f26a97cafae3a9ae545d0147f575fc7b5512ab9395287ccd0183. 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/USLZJ2163893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85dcb252fea5a4b283bad2de63090e4e484ffacacbc2c5078e6a3053aadb971. 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/USLZJ2163934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9f70e746f1a9434e4ba20767a82b4beab3a3e2aad6170468cca21ebc714da9. 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/GBWUL2006106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900012712cf24234af642939104af7630e8d5e3089286092626048215a53268a. 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/TCADS1888174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2846d15fe8ad11d0232e1047ff006cf4891c1dcf464972be132d7eb8aa94caac. 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/TCADR1823971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb363fe77a2e26dd4360b4635259c4432e13455a27afb292f950ced0aab6a02a8. 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/TCACH1537876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04056ad8c87568d5eae727d14dadd7042089223a153d0a2f952924ffb7a23a57. 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/QM6N22426202.