thumb|200px|Concert in Braga Os Quatro e Meia (loose translation: "The Four and A Half") are a band from Coimbra, Portugal. The band emerged in 2013, after a successful performance by a group of unive
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 0xd5d5fbd83ad6e5683113bad8ab82073cd57ec5f6606cf67fffe2da1b1a04de76. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ead277a2-f349-4da7-ba69-a2015cb6a0ec.json and https://artists.proofprofile.net/proofs/artist/ead277a2-f349-4da7-ba69-a2015cb6a0ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Os Quatro e Meia - Ao Vivo no Estádio Cidade de Coimbra
A Manta do Teu Coração - Ao Vivo no Estádio Cidade De Coimbra
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 0xaa5c5140aea0e8c51f2fd7443aa5e186a1332c5b3e79eb7901d56f20976080fa. 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/PTBM12300049.
Guarda a Tua Alma - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c3cb732052532cebeb84a557b8ea688d6d98d14a28943c3e3b571e34bb1254. 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/PTBM12300050.
Bom Rapaz - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519265785308fcc538a21796e6c4800bf139308f6d3b88137908d6127a067505. 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/PTBM12300051.
Canção do Metro - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0d6cc01ce9435f993246696e3d8b50527c00ff58fabef0d195b843ec65e476. 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/PTBM12300052.
A Minha Mãe está Sempre Certa - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e3c0cf7b9e3b5ffdf1c06c4683b346d810e751ce8025076a2a0ef7ec659e4a. 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/PTBM12300053.
Pontos nos I's - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4ae4df8c0d6b7eddb0d4907acdf01545ea6c51a0926ba5fb14d51174d323ea. 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/PTBM12300054.
Interludio - I've Never Been There - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e558c5a55dc9e07f001e34071786b91446782899e2d936f910d7d9cee0d795. 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/PTBM12300055.
Coisas Tão Bonitas - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f471bca2ef9a45cce5e3faa88850161eceb79c019ca8cf597e16cfb6712bf7e. 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/PTBM12300056.
Sentir o Sol - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a0c442ae7e6ea0f5cb203d45be9d2a2c85ac430b657e79c36b9736f5d2c969. 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/PTBM12200092.
Medley Anaquim - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d21132955643b8671ce1e278dc37510b71c384b5797368b83aed1d6324f3c79. 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/PTBM12300070.
O Tempo Vai Esperar - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2212ae240b75af0ecaef65486d6196aa8e31c8e2acd9cd77a3141ef3be2a0ddf. 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/PTBM12300058.
Não Respondo Por Mim (feat. João Só) - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a46d4fa72da19cec6bc2a3691f007d1ca9dca5ff69da4f3bd3db89ef936866. 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/PTBM12300059.
Sabes Bem - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245dfe08724ebfc4893cf36326511a35fbea6366028d5c3bf9fb4c306d8778e2. 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/PTBM12300060.
Amanhã - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6866115bff16ff480390b461bf117e7be2fe86abc281ef2def0b35ae9f278d8. 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/PTBM12300111.
A Terra Gira (feat. Bárbara Tinoco) - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750870edf5b0a92ae2e93896ca88f4db82fe16a4f95950092b5386c785f77cad. 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/PTBM12300062.
Olá Solidão - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd2015cf6b70ea9fdab3844d2e7d93ce6e011e52cc5512343672ee6c4508b0b. 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/PTBM12300063.
Pra Frente é Que é Lisboa - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a427c6bd0cfe9ed74f858c87b3ed2e118b6664a2e55f806d71f661520dcbe5c. 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/PTBM12300064.
Na Escola - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921fb358cf8850ab53644c9d3c9787e5ac27d4a13062601975e592d9ebe0f8b0. 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/PTBM12300065.
Já Estou de Regresso, Amor - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9c50385b47be435744b655477b1bbab4eab0c1e73514310320e16a4cf805e0. 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/PTBM12300066.
Baile de São Simão - Ao Vivo no Estádio Cidade De Coimbra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5841f35be511dbe4144d15a3fe30434722c19581ed05761710d8234e56d6180. 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/PTBM12300067.