Barro (Spanish and Portuguese for mud or clay) may refer to: Arts, entertainment, and media Barro Humano, a 1929 Brazilian film El Dios de barro, a 1970 Mexican telenovela Entre el barro, a 1939 A
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 0xe15a855ffecb69e4f67d625472b49ffca8d14832dd2a50744134d28bc778882f. 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/464eccd3-7cbc-4c4a-a331-16b3b36e0293.json and https://artists.proofprofile.net/proofs/artist/464eccd3-7cbc-4c4a-a331-16b3b36e0293.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 0xf9cd1503652ab0e6a61ed6a1a11f9dd9fbd6c54f21f2cdf399471325964e77b0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US7VG1674039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d75aa87e7e7fbae7101f453708ca7531bd4507e08c1f7e261dcbf3f3e04878b. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BR6FF1600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fc0bf64612d1567d8314d20f45710cd9b27bfe817a48860ada4076eb085f83. 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/BR6FF1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90c74d220c2b63d38d28e35ec3e1c382ec3f5909de87b223009c6a788d6405b. 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/BR6FF1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce09db6d54af70b7f9de32e9d80898aab2a293cb59fdcb5dee6237b41edb225. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BR6FF1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b4d6b646313340bde27d7c5c24602a6fceed93af4a9576deac3f245792ca6d. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/BR6FF1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563dcaa2d71e3ef5b0a51b9edf6cec0f36d18738d67ad5b417f3197a16395f0f. 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/BR6FF1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08c15e77763921f4a24e4e516ffde75755d8bd5a65705425db38d0b80beb7e2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BR6FF1800008.
Debaixo da Ponte (Barro Canta Adoniran Barbosa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bed4533bf207cc84a8e7f28f0973d3f392991e3a68bf270ea7e1ceb65a6487. 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/BR6FF2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f6d42caf87b6c3af47d01e87b2ad943769d21f7ca8eb22828997ceb395c4ba. 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/BR6FF2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7658c3262f08e30623f4aeea70f4c89bbbbcf7a268017e3f5e2db438f1769d. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/BR6FF2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112eee08e3c5af2467e84da6e48caf70676caee7324d43e62aaf941feaf85def. 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/BR6FF2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c42c070664124af7bf209c70cb295522ffbc3d2f3dca7c9861f8946b5054671. 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/BR6FF2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181293f0f2b17c1105ddbbcb386ad62474d8e9a2762006a0c0c784418b98587a. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/BR6FF2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef83828891000b34998fc19e98c22470ca38dd7399420c50b408b3a37d4fb40b. 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/BR6FF2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c42c070664124af7bf209c70cb295522ffbc3d2f3dca7c9861f8946b5054671. 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/BR6FF2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6490967c0b6ddaf15046b6a6c51db1ff8996c6452dd205e409f070537f3eca. 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/BR6FF2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d862ab249ff88e86e7f9a24ff7b8ca221d2b91d1dcaddec9c021626799faa0. 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/BR6FF2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc230a13c52a5ac88a409a62dccda66165d3938e0ca68097914371569a1aa070f. 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/BR6FF2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280a68755903a1a41e48bcec745c22f81865f8d7a149e6b04964937566359873. 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/BR6FF2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef10f102d5ffac653838f9b47cdce64bf4bc28f30983dcef37ec0f0cacd3a39c. 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/BR6FF2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041d84535880ab98d7fbe7d21671be2ff0f912b79f2ed15eafc1774e44eca20b. 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/BXK1W2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041d84535880ab98d7fbe7d21671be2ff0f912b79f2ed15eafc1774e44eca20b. 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/BXK1W2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665ff86a15d9b92689b7cb76ee9a8ee3d026f7f75face5b74a1e85de8c07f6e2. 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/BXDFR2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493611cb2960b0df8d6e58e93a46ced373596b3a24ce041403368bf76b08623f. 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/ITO0P1700201.